Use a unique cache entry for wrapper-validation test (#921)

This is necessary to avoid loading a cache entry from a different test,
where the allowed wrapper checksums might have been cached, causing the
wrapper validation to unexpectedly succeed.

.github/workflows/integ-test-wrapper-validation.yml

@@ -12,6 +12,7 @@ on:
 
 env:
   SKIP_DIST: ${{ inputs.skip-dist }}
+  GRADLE_BUILD_ACTION_CACHE_KEY_PREFIX: wrapper-validation- # Avoid loading cache entries from other tests, that may have cached allowed wrapper checksums
 
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