[clang-tools-extra] [clang-tidy] Speed up `readability-container-contains` (PR #175121)

[Baranov Victor via cfe-commits]

vbvictor wrote:

The tests currently seems broken; take a look at https://godbolt.org/z/6bKG3Y8Y3.

The last warning is line 453, and in actual tests we should have 487 line

https://github.com/llvm/llvm-project/pull/175121