[libc++][test] Prefers the newer clang-tidy version.

Module require Clang 17, since Clang 16 requires the magic # __FILE__
line. Therefore, if available, use clang-tidy 17 too. This change should
be reverted after LLVM 17 is released.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D149455