[clang-tools-extra] [clang-tidy] Fix false positive in misc-redundant-expression with type aliases (PR #198085)

[Peiqi Li via cfe-commits]

voyager-jhk wrote:

@vbvictor @zeyi2 Following mizvekov's advice, I now use the AST Printer to compare the NestedNameSpecifier and TemplateArguments.

This safely preserves the sugared types, while natively normalizing all whitespaces and newlines.

Multiline tests added. PTAL!

https://github.com/llvm/llvm-project/pull/198085