[clang-tools-extra] [clang-tidy][NFC] use local config in test cases (PR #120004)

[Carlos Galvez via cfe-commits]

https://github.com/carlosgalvezp commented:

LGTM except the release notes, I think it would be more helpful to the users if we listed the changes explicitly.

https://github.com/llvm/llvm-project/pull/120004