[clang] Add tests for some CWG 5xx issues (#87909)

This patch covers
[CWG393](https://cplusplus.github.io/CWG/issues/393.html) "Pointer to
array of unknown bound in template argument list in parameter",
[CWG528](https://cplusplus.github.io/CWG/issues/528.html) "Why are
incomplete class types not allowed with `typeid`?",
[CWG550](https://cplusplus.github.io/CWG/issues/550.html) "Pointer to
array of unknown bound in parameter declarations",
[CWG553](https://cplusplus.github.io/CWG/issues/553.html) "Problems with
friend allocation and deallocation functions",
[CWG555](https://cplusplus.github.io/CWG/issues/555.html)
"Pseudo-destructor name lookup",
[CWG560](https://cplusplus.github.io/CWG/issues/560.html) "Use of the
`typename` keyword in return types".

CWG393 is on this list, because CWG550 is marked as a duplicate of
CWG393.

Test for CWG553 has been already written, but it was missing a status
comment. As a drive-by fix, I'm adding missing status comments to
CWG1584 and CWG1903 as well.

CWG555 used CWG466 test, and also a variation of that test to test
references. CWG466 is now testing non-reference non-pointer case.

CWG560 showcases again that converting warnings to errors in DR tests
via `-pedantic-errors` doesn't make things more clear. By default that
test is accepted with an extension warning since we implemented
[P0634R3](https://wg21.link/p0634r3) "Down with `typename`!" in Clang
16.