[clang-tools-extra] Allow to pass config file to clang-tidy-diff (PR #75457)

[Michael Lettrich via cfe-commits]

MichaelLettrich wrote:

@PiotrZSL thanks for the review I  added the to the release notes as requested.

@cjappl thanks for mentioning. I copied and adapted your release notes into this branch.

https://github.com/llvm/llvm-project/pull/75457