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

[via cfe-commits]

dyung 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`.

@rorth, if you are not already, can you please look into fixing this so that we can get the bot back to green?

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