[clang] [Clang] Fix type elision and diagnostic text formatting for nested template diffing (PR #198976)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

The LLVM AI rules require author written PR descriptions, this is almost exactly the kind of PR description produced by almost every LLM so I am unconvinced this is human written.

https://github.com/llvm/llvm-project/pull/198976