fix: use clang-format 15 after v7.4

[purelind]

user clang-format 15 after v7.4

releate to https://github.com/pingcap/tiflash/pull/7927/files#diff-a847e281c62ad2738f1616a96cd3174ca1fa5eba8134bf6f5d802a425c92c8b2R86-R90

[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.

Based on the pull request title and description, the key change here is the addition of a new stage named "clang-foramt-15" that installs clang-format-15.

Potential problems that could arise from this change include:

1. The new stage might not be necessary, and it could increase the build time unnecessarily.
2. The script to install clang-format-15 could fail for a variety of reasons (e.g., incorrect permissions, missing dependencies, etc.), which would cause the build to fail.

To address these potential problems, here are some suggestions:

1. Double-check whether the new stage is necessary. If it is, consider adding some conditional logic to skip the stage if clang-format-15 is already installed.
2. Add some error handling to the script to install clang-format-15. For example, you could use set -e to ensure that the script exits immediately if any command fails. You could also add some checks to ensure that the installation was successful (e.g., by running clang-format-15 --version and checking the output).

Overall, it seems like a relatively minor change that shouldn't cause too many issues, as long as the script to install clang-format-15 is robust.

[ti-chi-bot]

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