build: refactor build setup

[derklaro]

Motivation

The current build is not setup properly, leading to several issues, for example jar file contents (shadowed dependencies are being published in the jar), empty modules being published or the unabilitiy to upgrade to gradle 9 due to deprecated gradle features being used for a long time.

Modification

Rework and cleanup the entire gradle build, upgrade to gradle 9.1.0, activate configuration cache. Fixed task execution, build now actually builds everything (to be more precise: assemble builds everything, build is assemble + all tests/checks).

Result

Overall better build performance and no more deprecated features used.

Other context

Resolves #1611 (based upon the linked pr, with more cleanups and fixed applied)

[github-actions]

Test Results

 56 files  ±0   56 suites  ±0   3m 26s ⏱️ + 1m 35s
570 tests ±0  570 ✅ ±0  0 💤 ±0  0 ❌ ±0 
937 runs  ±0  937 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 658b69a. ± Comparison against base commit fe50bd8.

This pull request removes 36 and adds 36 tests. Note that renamed tests count towards both.

eu.cloudnetservice.driver.impl.document.DocumentSerialisationTest ‑ [4] {"b":1,"s":2,"i":3,"l":4,"f":5.0,"d":6.0,"c":"/","string":"Hello, World!","bol":true,"cloud":["Ben?","Yes","No","HoHoHoHo"],"world":{"hello":"world","insane":"!","this":"is"}}, PRETTY
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [14] 2025-09-10
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [23] 15:49:21.393978587
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [28] 15:49:21.394081439Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [29] 15:49:21.394102398Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [30] 15:49:21.394122656+05:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [31] 15:49:21.394139498-03:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [34] 2025-09-10T15:49:21.394266666
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [39] 2025-09-10T15:49:21.396957451Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [4] 2025-09-10T15:49:21.388606624Z
…

eu.cloudnetservice.driver.impl.document.DocumentSerialisationTest ‑ [4] {"b":1,"s":2,"i":3,"l":4,"f":5.0,"d":6.0,"c":"/","string":"Hello, World!","bol":true,"cloud":["Ben?","Yes","No","HoHoHoHo"],"world":{"hello":"world","this":"is","insane":"!"}}, PRETTY
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [14] 2025-09-30
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [23] 19:31:16.750482451
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [28] 19:31:16.750584355Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [29] 19:31:16.750604602Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [30] 19:31:16.750642921+05:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [31] 19:31:16.750667957-03:00
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [34] 2025-09-30T19:31:16.750820577
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [39] 2025-09-30T19:31:16.753276485Z
eu.cloudnetservice.driver.impl.document.gson.JavaTimeSerializerTest ‑ [4] 2025-09-30T19:31:16.740380082Z
…

♻️ This comment has been updated with latest results.