chore: make library generation integration test required

Author: JoeWang1127

.github/sync-repo-settings.yaml

@@ -21,6 +21,7 @@ branchProtectionRules:
   - graalvm-presubmit-sdk-platform-java-a-downstream-kmsinventory (java-graalvm-ci-prod)
   - graalvm-presubmit-sdk-platform-java-b-downstream-kmsinventory (java-graalvm-ci-prod)
   - library_generation
+  - library-generation-integration-test (java-hermetic-build-prod)
   - library-generation-lint-python
   - library-generation-lint-shell
   - library-generation-unit-tests