fix: revert reverting [Many APIs] Update WORKSPACE files for rules_gapic, gax_java, generator_java versions#8340

suztomo merged 8 commits intomaingoogleapis/google-cloud-java:mainfrom

revert-8337-remove_owl-bot-staginggoogleapis/google-cloud-java:revert-8337-remove_owl-bot-stagingCopy head branch name to clipboard