[clang-tools-extra] [clang-tidy] Fix readability-identifier-naming FP on function templates (PR #198517)

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CarvedCoder wrote:

I was testing across multiple local LLVM builds while debugging this, so I mixed up the branches between my local trunk build and an older one.

I will revert these changes and send the forward declaration fix and sorry for the late reply i had my sem exams 

https://github.com/llvm/llvm-project/pull/198517