[clang] [llvm] [clang][python][test] Move python binding tests to lit framework (PR #145855)

[Rainer Orth via cfe-commits]

rorth wrote:

The `llvm-clang-x86_64-sie-ubuntu-fast` builder is an other cross setup:
```
      LLVM host triple: x86_64-unknown-linux-gnu
      LLVM default target triple: x86_64-scei-ps4
```
I strongly suspect we need `REQUIRES: native` rather than `XFAIl: !native`.

https://github.com/llvm/llvm-project/pull/145855