[clang] [libclang/python] Refactor enum usage (PR #95608)

[Jannick Kremer via cfe-commits]

DeinAlptraum wrote:

Hmm what do you think should be mentioned in a release note @Endilll ?
Since this is just refactoring, if I did everything correctly, users of the bindings should not notice any difference (except for different error messages). So just mention refactoring of enums in the bindings?

https://github.com/llvm/llvm-project/pull/95608