[llvm] [workflow] Don't add a comment when the first run of the formatter passes (PR #86335)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

:white_check_mark: With the latest revision this PR passed the C/C++ code formatter.

https://github.com/llvm/llvm-project/pull/86335