--per_file_copt requires argument changes with bzlmod

[keith]

If you passed something like --per_file_copt=external/com_google_protobuf/.*.cpp@-Wno-type-limits, and try to move to bzlmod, the flag no longer works because the repository name is taken literally and doesn't contain the version info. In this case you likely need something like external/protobuf~.*/, but ideally your existing flags would keep working and this wouldn't be taken so literally. I'm sure there are other flags with a similar issue

[github-actions]

Thank you for contributing to the Bazel repository! This issue has been marked as stale since it has not had any activity in the last 30 days. It will be closed in the next 7 days unless any other activity occurs or one of the following labels is added: "not stale", "awaiting-bazeler".

[brentleyjones]

cc @Wyverald

(And not stale)

[Wyverald]

I believe this is just a dupe of #15553. Let me know if that's not true!