chore(librarian): add tag_format for googleapis-common-protos (#14599)

Add `tag_format` to `googleapis-common-protos` which was accidentally
removed in
https://github.com/googleapis/google-cloud-python/pull/14589/files

Author: parthea

.librarian/state.yaml

@@ -1007,6 +1007,7 @@ libraries:
     preserve_regex: []
     remove_regex:
       - ^packages/googleapis-common-protos/google/(?:api|cloud|rpc|type)/.*/.*_pb2\.(?:py|pyi)$
+    tag_format: '{id}-v{version}'
   - id: google-cloud-storagebatchoperations
     version: 0.1.3
     last_generated_commit: d300b151a973ce0425ae4ad07b3de957ca31bec6