[clang-tools-extra] [clang-tidy] Add QtEnabled option to modernize-use-integer-sign-comprison (PR #122127)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL approved this pull request.

Except pointed out nits, looks fine.

https://github.com/llvm/llvm-project/pull/122127