[llvm-branch-commits] [clang] release/23.x: Revert "Reland "[Clang] Enable -Wunused-template under -Wall" (#208001)" (#218638) (PR #218678)

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llvmbot wrote:

@Fznamznon What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/218678