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

[Tobias Hieta via llvm-commits]

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@@ -14,8 +14,22 @@
 import sys
 from functools import cached_property
 
-import github
-from github import IssueComment, PullRequest
+
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tru wrote:

This should be fine now.

I wonder if maybe we should add a [pre-commit](https://pre-commit.com/) configuration for LLVM as well.

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