[clang] Revert "Reapply "[Clang][Sema] Refactor collection of multi-level template argument lists (#106585, #111173)" (#111852)" (PR #115159)

[Krystian Stasiowski via cfe-commits]

https://github.com/sdkrystian closed 
https://github.com/llvm/llvm-project/pull/115159
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