[llvm] code-format: Improve the code-format-helper to be able to run as a git hook (PR #73957)

[Aiden Grossman via llvm-commits]

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

Nothing else from me. Thank you for very much for putting this together and for making it broadly useful across all of LLVM!

https://github.com/llvm/llvm-project/pull/73957