[clang-tools-extra] [clang-tidy] Add IgnoreAboveThreshold option to readability-function-cognitive-complexity (PR #178965)

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mugiwaraluffy56 wrote:

@vbvictor Done. Added a typed constant for template deduction and included a validation warning when IgnoreAboveThreshold < Threshold.

https://github.com/llvm/llvm-project/pull/178965