[clang] [llvm] [clang] Add test run of 'dump_ast_matchers.py' (PR #165472)

[Baranov Victor via llvm-commits]

vbvictor wrote:

Disabled test on Windows because of error which makes re-generated file different from expected:
```
<urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)>
```

This should be either fixed by tinkering with certs in win-builder or by adjusting `dump_ast_matchers.py`.
But I believe this should be out of current scope because Linux builder still run it the test is platform-independent.

https://github.com/llvm/llvm-project/pull/165472