diff --git a/.ci.yaml b/.ci.yaml
index df3291f8b14..37590f9c73b 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -131,10 +131,6 @@ targets:
           {"dependency": "clang", "version": "git_revision:5d5aba78dbbee75508f01bcaa69aedb2ab79065a"},
           {"dependency": "open_jdk", "version": "version:21"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux dart_unit_test_shard_1 master
     recipe: packages/packages
@@ -145,11 +141,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 0 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Linux dart_unit_test_shard_2 master
     recipe: packages/packages
@@ -159,11 +150,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 1 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   - name: Linux dart_unit_test_shard_1 stable
     recipe: packages/packages
@@ -173,11 +159,6 @@ targets:
       channel: stable
       version_file: flutter_stable.version
       package_sharding: "--shardIndex 0 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Linux dart_unit_test_shard_2 stable
     recipe: packages/packages
@@ -187,11 +168,6 @@ targets:
       channel: stable
       version_file: flutter_stable.version
       package_sharding: "--shardIndex 1 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   - name: Linux_web web_dart_unit_test_shard_1 master
     recipe: packages/packages
@@ -202,11 +178,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 0 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Linux_web web_dart_unit_test_shard_2 master
     recipe: packages/packages
@@ -216,11 +187,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 1 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   - name: Linux_web web_dart_unit_test_shard_1 stable
     recipe: packages/packages
@@ -230,11 +196,6 @@ targets:
       channel: stable
       version_file: flutter_stable.version
       package_sharding: "--shardIndex 0 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Linux_web web_dart_unit_test_shard_2 stable
     recipe: packages/packages
@@ -244,11 +205,6 @@ targets:
       channel: stable
       version_file: flutter_stable.version
       package_sharding: "--shardIndex 1 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   # Wasm unit tests in master
   - name: Linux_web web_dart_unit_test_wasm_shard_1 master
@@ -260,11 +216,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 0 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Linux_web web_dart_unit_test_wasm_shard_2 master
     recipe: packages/packages
@@ -274,11 +225,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 1 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   - name: Linux analyze master
     recipe: packages/packages
@@ -287,10 +233,6 @@ targets:
       target_file: analyze.yaml
       channel: master
       version_file: flutter_master.version
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux analyze stable
     recipe: packages/packages
@@ -299,10 +241,6 @@ targets:
       target_file: analyze.yaml
       channel: stable
       version_file: flutter_stable.version
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   # This is only run on stable since it's extremely likely that stable will
   # resolve to packages that are older (or at least as old) than on master, so
@@ -315,10 +253,6 @@ targets:
       target_file: analyze_downgraded.yaml
       channel: stable
       version_file: flutter_stable.version
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   # Analyze with the previous stable (N-1) and the stable before that (N-2). The
   # versions in `channel` should be updated after a new major stable release.
@@ -328,10 +262,6 @@ targets:
     properties:
       target_file: analyze_legacy.yaml
       channel: "3.38.10"
-      env_variables: >-
-        {
-          "CHANNEL": "3.38.10"
-        }
 
   - name: Linux analyze_legacy N-2
     recipe: packages/packages
@@ -339,10 +269,6 @@ targets:
     properties:
       target_file: analyze_legacy.yaml
       channel: "3.35.7"
-      env_variables: >-
-        {
-          "CHANNEL": "3.35.7"
-        }
 
   - name: Linux_android custom_package_tests master
     recipe: packages/packages
@@ -365,10 +291,6 @@ targets:
           {"dependency": "chrome_and_driver", "version": "version:125.0.6422.141"}
         ]
       channel: master
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux_android custom_package_tests stable
     recipe: packages/packages
@@ -388,10 +310,6 @@ targets:
           {"dependency": "chrome_and_driver", "version": "version:125.0.6422.141"}
         ]
       channel: stable
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   ### Android tasks ###
   - name: Linux_android android_build_all_packages master
@@ -402,10 +320,6 @@ targets:
       # This builds the all_packages app only in a current JDK.
       target_file: android_build_all_packages.yaml
       channel: master
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux_android android_build_all_packages stable
     recipe: packages/packages
@@ -416,10 +330,6 @@ targets:
       # This builds the all_packages app only in a current JDK.
       target_file: android_build_all_packages.yaml
       channel: stable
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   - name: Linux_android android_platform_tests_shard_1 master
     recipe: packages/packages
@@ -433,11 +343,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_2 master
     recipe: packages/packages
@@ -451,11 +356,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_3 master
     recipe: packages/packages
@@ -469,11 +369,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_4 master
     recipe: packages/packages
@@ -487,11 +382,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 3 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_5 master
     recipe: packages/packages
@@ -505,11 +395,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 4 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_6 master
     recipe: packages/packages
@@ -523,11 +408,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 5 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_1 stable
     recipe: packages/packages
@@ -542,11 +422,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_2 stable
     recipe: packages/packages
@@ -561,11 +436,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_3 stable
     recipe: packages/packages
@@ -580,11 +450,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_4 stable
     recipe: packages/packages
@@ -599,11 +464,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 3 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_5 stable
     recipe: packages/packages
@@ -618,11 +478,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 4 --shardCount 6"
-        }
 
   - name: Linux_android android_platform_tests_shard_6 stable
     recipe: packages/packages
@@ -637,11 +492,6 @@ targets:
         [
           {"dependency": "android_virtual_device", "version": "android_36_google_apis_x64.textpb"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 5 --shardCount 6"
-        }
 
   - name: Linux_android_legacy android_platform_tests_legacy_api_shard_1 master
     recipe: packages/packages
@@ -651,11 +501,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 0 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 6"
-        }
 
   - name: Linux_android_legacy android_platform_tests_legacy_api_shard_2 master
     recipe: packages/packages
@@ -665,11 +510,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 1 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 6"
-        }
 
   - name: Linux_android_legacy android_platform_tests_legacy_api_shard_3 master
     recipe: packages/packages
@@ -679,11 +519,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 2 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 6"
-        }
 
   - name: Linux_android_legacy android_platform_tests_legacy_api_shard_4 master
     recipe: packages/packages
@@ -693,11 +528,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 3 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 3 --shardCount 6"
-        }
 
   - name: Linux_android_legacy android_platform_tests_legacy_api_shard_5 master
     recipe: packages/packages
@@ -707,11 +537,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 4 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 4 --shardCount 6"
-        }
 
   - name: Linux_android_legacy android_platform_tests_legacy_api_shard_6 master
     recipe: packages/packages
@@ -721,11 +546,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 5 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 5 --shardCount 6"
-        }
 
   # Device versions of Android integration tests, run via FTL.
   # TODO(stuartmorgan): Revisit whether physical device tests are redundant once
@@ -740,11 +560,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 0 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 6"
-        }
 
   - name: Linux_android android_device_tests_shard_2 master
     recipe: packages/packages
@@ -754,11 +569,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 1 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 6"
-        }
 
   - name: Linux_android android_device_tests_shard_3 master
     recipe: packages/packages
@@ -768,11 +578,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 2 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 6"
-        }
 
   - name: Linux_android android_device_tests_shard_4 master
     recipe: packages/packages
@@ -782,11 +587,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 3 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 3 --shardCount 6"
-        }
 
   - name: Linux_android android_device_tests_shard_5 master
     recipe: packages/packages
@@ -796,11 +596,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 4 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 4 --shardCount 6"
-        }
 
   - name: Linux_android android_device_tests_shard_6 master
     recipe: packages/packages
@@ -810,11 +605,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 5 --shardCount 6"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 5 --shardCount 6"
-        }
 
   ### Web tasks ###
   - name: Linux_web web_build_all_packages master
@@ -825,10 +615,6 @@ targets:
       version_file: flutter_master.version
       target_file: web_build_all_packages.yaml
       channel: master
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux_web web_build_all_packages stable
     recipe: packages/packages
@@ -837,10 +623,6 @@ targets:
       version_file: flutter_stable.version
       target_file: web_build_all_packages.yaml
       channel: stable
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   # JS integration tests in master
   - name: Linux_web web_platform_tests_shard_1 master
@@ -851,11 +633,6 @@ targets:
       version_file: flutter_master.version
       channel: master
       package_sharding: "--shardIndex 0 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 3"
-        }
 
   - name: Linux_web web_platform_tests_shard_2 master
     recipe: packages/packages
@@ -865,11 +642,6 @@ targets:
       version_file: flutter_master.version
       channel: master
       package_sharding: "--shardIndex 1 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 3"
-        }
 
   - name: Linux_web web_platform_tests_shard_3 master
     recipe: packages/packages
@@ -879,11 +651,6 @@ targets:
       version_file: flutter_master.version
       channel: master
       package_sharding: "--shardIndex 2 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 3"
-        }
 
   # Wasm integration tests in master
   - name: Linux_web web_platform_tests_wasm_shard_1 master
@@ -894,11 +661,6 @@ targets:
       version_file: flutter_master.version
       channel: master
       package_sharding: "--shardIndex 0 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 3"
-        }
 
   - name: Linux_web web_platform_tests_wasm_shard_2 master
     recipe: packages/packages
@@ -908,11 +670,6 @@ targets:
       version_file: flutter_master.version
       channel: master
       package_sharding: "--shardIndex 1 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 3"
-        }
 
   - name: Linux_web web_platform_tests_wasm_shard_3 master
     recipe: packages/packages
@@ -922,11 +679,6 @@ targets:
       version_file: flutter_master.version
       channel: master
       package_sharding: "--shardIndex 2 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 3"
-        }
 
   # JS integration tests in stable
   - name: Linux_web web_platform_tests_shard_1 stable
@@ -937,11 +689,6 @@ targets:
       version_file: flutter_stable.version
       channel: stable
       package_sharding: "--shardIndex 0 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 3"
-        }
 
   - name: Linux_web web_platform_tests_shard_2 stable
     recipe: packages/packages
@@ -951,11 +698,6 @@ targets:
       version_file: flutter_stable.version
       channel: stable
       package_sharding: "--shardIndex 1 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 3"
-        }
 
   - name: Linux_web web_platform_tests_shard_3 stable
     recipe: packages/packages
@@ -965,11 +707,6 @@ targets:
       version_file: flutter_stable.version
       channel: stable
       package_sharding: "--shardIndex 2 --shardCount 3"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 3"
-        }
 
   ### Linux desktop tasks
   - name: Linux_desktop build_all_packages master
@@ -980,10 +717,6 @@ targets:
       version_file: flutter_master.version
       target_file: linux_build_all_packages.yaml
       channel: master
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux_desktop build_all_packages stable
     recipe: packages/packages
@@ -992,10 +725,6 @@ targets:
       version_file: flutter_stable.version
       target_file: linux_build_all_packages.yaml
       channel: stable
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   - name: Linux_desktop platform_tests master
     recipe: packages/packages
@@ -1009,10 +738,6 @@ targets:
         [
           {"dependency": "chrome_and_driver", "version": "version:125.0.6422.141"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux_desktop platform_tests stable
     recipe: packages/packages
@@ -1027,10 +752,6 @@ targets:
         [
           {"dependency": "chrome_and_driver", "version": "version:125.0.6422.141"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   ### iOS+macOS tasks ###
   - name: Mac_arm64 macos_repo_checks
@@ -1050,10 +771,6 @@ targets:
       version_file: flutter_master.version
       target_file: macos_build_all_packages.yaml
       channel: master
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Mac_x64 build_all_packages stable
     recipe: packages/packages
@@ -1063,10 +780,6 @@ targets:
       version_file: flutter_stable.version
       target_file: macos_build_all_packages.yaml
       channel: stable
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   # TODO(stuartmorgan): Remove "- packages" from all task names once
   # flutter/plugins is merged into this repo and turned down; it's here only
@@ -1079,10 +792,6 @@ targets:
       add_recipes_cq: "true"
       version_file: flutter_master.version
       target_file: macos_platform_tests.yaml
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Mac_arm64 macos_platform_tests stable - packages
     recipe: packages/packages
@@ -1092,10 +801,6 @@ targets:
       channel: stable
       version_file: flutter_stable.version
       target_file: macos_platform_tests.yaml
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   - name: Mac_arm64 custom_package_tests master
     recipe: packages/packages
@@ -1104,10 +809,6 @@ targets:
       version_file: flutter_master.version
       target_file: macos_custom_package_tests.yaml
       channel: master
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Mac_arm64 custom_package_tests stable
     recipe: packages/packages
@@ -1116,10 +817,6 @@ targets:
       version_file: flutter_stable.version
       target_file: macos_custom_package_tests.yaml
       channel: stable
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   ### iOS tasks ###
   # ios_platform_tests builds all the packages on ARM, so this build is run
@@ -1131,10 +828,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       target_file: ios_build_all_packages.yaml
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Mac_x64 ios_build_all_packages stable
     recipe: packages/packages
@@ -1143,10 +836,6 @@ targets:
       channel: stable
       version_file: flutter_stable.version
       target_file: ios_build_all_packages.yaml
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_1 master
     recipe: packages/packages
@@ -1157,11 +846,6 @@ targets:
       version_file: flutter_master.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 0 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_2 master
     recipe: packages/packages
@@ -1171,11 +855,6 @@ targets:
       version_file: flutter_master.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 1 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_3 master
     recipe: packages/packages
@@ -1185,11 +864,6 @@ targets:
       version_file: flutter_master.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 2 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_4 master
     recipe: packages/packages
@@ -1199,11 +873,6 @@ targets:
       version_file: flutter_master.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 3 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 3 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_5 master
     recipe: packages/packages
@@ -1213,11 +882,6 @@ targets:
       version_file: flutter_master.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 4 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 4 --shardCount 5"
-        }
 
   # Don't run full platform tests on both channels in pre-submit.
   - name: Mac_arm64 ios_platform_tests_shard_1 stable
@@ -1229,11 +893,6 @@ targets:
       version_file: flutter_stable.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 0 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_2 stable
     recipe: packages/packages
@@ -1244,11 +903,6 @@ targets:
       version_file: flutter_stable.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 1 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_3 stable
     recipe: packages/packages
@@ -1259,11 +913,6 @@ targets:
       version_file: flutter_stable.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 2 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 2 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_4 stable
     recipe: packages/packages
@@ -1274,11 +923,6 @@ targets:
       version_file: flutter_stable.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 3 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 3 --shardCount 5"
-        }
 
   - name: Mac_arm64 ios_platform_tests_shard_5 stable
     recipe: packages/packages
@@ -1289,11 +933,6 @@ targets:
       version_file: flutter_stable.version
       target_file: ios_platform_tests.yaml
       package_sharding: "--shardIndex 4 --shardCount 5"
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 4 --shardCount 5"
-        }
 
   ### Windows desktop tasks ###
   - name: Windows_x64 custom_package_tests master - packages
@@ -1307,10 +946,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Windows_x64 dart_unit_tests_shard_1 master
     recipe: packages/packages
@@ -1320,11 +955,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 0 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Windows_x64 dart_unit_tests_shard_2 master
     recipe: packages/packages
@@ -1334,11 +964,6 @@ targets:
       channel: master
       version_file: flutter_master.version
       package_sharding: "--shardIndex 1 --shardCount 2"
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   - name: Windows_x64 win32-platform_tests_shard_1 master
     recipe: packages/packages
@@ -1353,11 +978,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Windows_x64 win32-platform_tests_shard_2 master
     recipe: packages/packages
@@ -1371,11 +991,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   - name: Windows_x64 win32-platform_tests_shard_1 stable
     recipe: packages/packages
@@ -1389,11 +1004,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 0 --shardCount 2"
-        }
 
   - name: Windows_x64 win32-platform_tests_shard_2 stable
     recipe: packages/packages
@@ -1407,11 +1017,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable",
-          "PACKAGE_SHARDING": "--shardIndex 1 --shardCount 2"
-        }
 
   - name: Windows_x64 windows-build_all_packages master
     recipe: packages/packages
@@ -1424,10 +1029,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Windows_arm64 windows-build_all_packages master
     recipe: packages/packages
@@ -1442,10 +1043,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Windows_x64 windows-build_all_packages stable
     recipe: packages/packages
@@ -1458,10 +1055,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   - name: Windows_arm64 windows-build_all_packages stable
     recipe: packages/packages
@@ -1475,10 +1068,6 @@ targets:
         [
           {"dependency": "vs_build", "version": "version:vs2019"}
         ]
-      env_variables: >-
-        {
-          "CHANNEL": "stable"
-        }
 
   - name: Windows_x64 repo_tools_tests
     recipe: packages/packages
@@ -1488,10 +1077,6 @@ targets:
       target_file: repo_tools_tests.yaml
       channel: master
       version_file: flutter_master.version
-      env_variables: >-
-        {
-          "CHANNEL": "master"
-        }
 
   - name: Linux ci_yaml packages roller
     recipe: infra/ci_yaml