test: mark WASI's test-return-on-exit as flaky

Refs: #36139

PR-URL: #36139
Reviewed-By: Jiawen Geng <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Myles Borins <[email protected]>
Reviewed-By: Shelley Vohr <[email protected]>

Author: cjihrig

test/wasi/wasi.status

@@ -5,3 +5,7 @@ prefix wasi
 # sample-test                        : PASS,FLAKY
 
 [true] # This section applies to all platforms
+
+[$system==win32]
+# https://github.com/nodejs/node/pull/36139
+test-return-on-exit: PASS,FLAKY