Revert [clang] Handle templated operators with reversed arguments and...

Revert [clang] Handle templated operators with reversed arguments and [STLExtras] Undo C++20 hack (#69937)

This breaks C++20 build of LLVM by clang 17 and earlier.
Next steps should be reduce error to a warning for
https://godbolt.org/z/s99bvq4sG
b100ca6f219fda1fed5b92aba8471aa9a6ef8906 or similar should be reapplied
after the bug fix reached clang-18.