[clang] Reapply "[Clang][Sema] Refactor collection of multi-level template argument lists (#106585)" (PR #111173)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@zyn0217 I have quite a few test cases I'll be adding soon
https://github.com/llvm/llvm-project/pull/111173
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