[llvm] [GitHub][CI] Run clang-format natively in ci-ubuntu container (PR #161073)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

I think this is fine for a temporary solution.

The only worry I have about this is that this patch ties the CI versions together, which we ideally don't want to do to avoid churn with the clang format version bumps. That should be temporary though assuming there is a concerted effort to get a clang-format specific container up and working.

https://github.com/llvm/llvm-project/pull/161073