[clang-tidy] allow tests to use --config-file instead of --config

The previous way to test hungarian notation doesn't check CHECK-FIXES.

This will allow readability-identifier-naming tests of Hungarian
notation to keep the use of an external .clang-tidy file (not embedded
within the .cpp test file) and properly check CHECK-FIXES.

Also, it turns out the hungarian notation tests use the wrong
.clang-tidy file, so fix that too to make these tests ok.

This is a part of a fix for issue https://github.com/llvm/llvm-project/issues/60670.

Reviewed By: carlosgalvezp

Differential Revision: https://reviews.llvm.org/D144037