chore: update release_level in repo-metadata.json (#78)

* chore: update .repo-metadata.json

* revert

* remove api_shortname

Author: parthea

.repo-metadata.json

@@ -3,7 +3,7 @@
     "name_pretty": "Google APIs Common Protos",
     "client_documentation": "https://github.com/googleapis/python-api-common-protos",
     "issue_tracker": "https://github.com/googleapis/python-api-common-protos/issues",
-    "release_level": "ga",
+    "release_level": "stable",
     "language": "python",
     "library_type": "CORE",
     "repo": "googleapis/python-api-common-protos",