[clang] [libclang/python] Add tests for equality operators. (PR #138132)

[Jannick Kremer via cfe-commits]

DeinAlptraum wrote:

@Endilll Thank you, I put the removal of the compatibility stuff in a separate PR here: https://github.com/llvm/llvm-project/pull/138135

https://github.com/llvm/llvm-project/pull/138132