[clang] [Clang][Sema] Implement approved resolution for CWG2858 (PR #88042)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@cor3ntin Should I just move the test from `test/CXX/expr/expr.prim/expr.prim.id/expr.prim.id.qual/p3.cpp` to `test/CXX/drs/dr28xx.cpp`?

https://github.com/llvm/llvm-project/pull/88042