[clang-tidy] Rename performance-faster-string-find to performance-prefer-single-char-overloads (#186946)
Related discussion:
https://github.com/llvm/llvm-project/pull/182697#issuecomment-3986242476
Closes https://github.com/llvm/llvm-project/issues/186853
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Co-authored-by: Victor Chernyakin <chernyakin.victor.j@outlook.com>