[clang] [clang-format] Hanlde qualified type name for `QualifierAlignment` (PR #125327)

[Owen Pan via cfe-commits]

owenca wrote:

Same reason we almost never handle them, just like we (almost?) never handle the possibility of templated qualified names of arbitrary nesting levels (e.g. `A1<B1>::A2<B2> … An<Bn>`) and of comments before _every_ token. We can always tweak the code if and when we need to handle these rare cases.

https://github.com/llvm/llvm-project/pull/125327