The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Actually hold on: I'm going to split this in two, one to remove the usage from protovalidate-testing and one to remove the message from protovalidate. That way we can do it in two separate releases and avoid needing to hack around module syncing issues.

Closing this for now as we've determined after extensive discussion that we can't really do this right now, due to existing uses of Violations and Violation outside of protovalidate itself. Will revisit before 1.0.