[clang-tools-extra] [run-clang-tidy] Accept directory as value for -export-fixes (PR #69453)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL commented:

Release notes will be needed, in clang-tools-extra/docs/ReleaseNotes.rst.
Additionally probably similar change should be done to clang-tidy-diff.py

https://github.com/llvm/llvm-project/pull/69453