[clang-tools-extra] [clang-tools-extra] Apply modernize-use-string-view to the code (PR #179514)

[Baranov Victor via cfe-commits]

vbvictor wrote:

> Thanks for your feedback. So 1) Remove any non-clang-tidy files from this PR and 2) create separate PRs for all other products?

Sound good to me, we can merge this with only clang-tidy changes.

https://github.com/llvm/llvm-project/pull/179514