Sanitize file names

[parthea]

There is a syntax issue here with the generated client for Cloud Run. The issue is that there is a proto file here which does not use the correct snake case format.

We should fix this issue in the generator as it may be difficult to rename the proto. I've opened a PR to improve the api-linter to help catch the issue upstream in the future.

To workaround the issue, the line from google.cloud.run_v2.types import k8s.min should be changed to from google.cloud.run_v2.types import k8s_min.