[clang-tools-extra] [clang-tidy] Enhance modernize-use-starts-ends-with to handle substr patterns (PR #116033)

[Nicolas van Kempen via cfe-commits]

nicovank wrote:

@hjanuschka Let's give it another day or so then I’ll go ahead and click merge if there are no other comments 👍

https://github.com/llvm/llvm-project/pull/116033