[clang] [clang][python] Add CLANG_DISABLE_RUN_PYTHON_TESTS CMake option to disable clang python bindings tests (PR #111367)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

> We already have hard-coded logic to disable adding these tests to the `check-all` target in various cases.

Why do you have to do that?

https://github.com/llvm/llvm-project/pull/111367