[clang] [llvm] [clang][python][test] Move python binding tests to lit framework (PR #146486)

[Jannick Kremer via llvm-commits]

DeinAlptraum wrote:

This is the next attempt at https://github.com/llvm/llvm-project/pull/145855.
I've only replaced the `XFAIL: !native` with a `REQUIRES: native` as suggested here: https://github.com/llvm/llvm-project/pull/145855#issuecomment-3008770797

@dyung if you have any other feedback or suggestions, I'd love to hear it! (I am not at all proficient with lit unfortunately, but would hate to let rorth's work go to waste here)
Otherwise I will merge this later. Should it lead to failures again, I should be able to revert immedtiately. 

https://github.com/llvm/llvm-project/pull/146486