[clang] Qualify non-dependent types of a class template with its declaration (PR #67566)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

It's recommended to avoid introducing pure clang-format changes mixed with other non-style changes.

The recommended way to avoid that is to run clang-format on the modified files on a separate commit, and then just merge that, no review required.

https://github.com/llvm/llvm-project/pull/67566