[clang-tools-extra] [clang-tidy] Add avoid-pragma-once. (PR #140388)

[Tommy Chen via cfe-commits]

dl8sd11 wrote:

Fixed!

First time adding a clang-tidy check! Apologies for missing the conventions, 
and huge thanks for your time reviewing.

https://github.com/llvm/llvm-project/pull/140388
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