[clang-tools-extra] [clang-apply-replacements] Apply format only if --format is specified (PR #70801)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

The changes LGTM but we should probably add a release note to https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/docs/ReleaseNotes.rst?plain=1 so users know about the fix.

https://github.com/llvm/llvm-project/pull/70801