Do not commit compiled protobufs

Why are these changes needed?

Committing compiled protobufs to the repo is kind of clunky, and makes code reviews that modify protobuf files tricky.

[x] I've made sure the lint is passing in this PR.
[x] I've made sure the tests are passing. Note that there might be a few flaky tests, in that case, please comment that they are not relevant.
[ ] I've checked the new test coverage and the coverage percentage didn't drop.
Testing Strategy
- [x] Unit tests
- [x] Integration tests
- [ ] This PR is not tested :(