[clang] Reapply "[Clang][Sema] Diagnose function/variable templates that shadow their own template parameters (#78274)" (PR #79683)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@cor3ntin Addressed review comments... Please approve if it all checks out :)

https://github.com/llvm/llvm-project/pull/79683
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