treat resolved symbols on RHS of module qualification as identifiers

[metagn]

fixes #19866 given #23997

When searching for a module-qualified symbol, qualifiedLookUp tries to obtain the raw identifier from the RHS of the dot field. However it only does this when the RHS is either an nkIdent or an nkAccQuoted node, not when the node is a resolved symbol or a symchoice, such as in templates and generics when the module symbol can't be resolved yet. Since the LHS is a module symbol when the compiler checks for this, any resolved symbol information doesn't matter, since it has to be a member of the module. So we now obtain the identifier from these nodes as well as the unresolved identifier nodes.

The test is a bit niche and possibly not officially supported, but this is likely a more general problem and I just couldn't think of another test that would be more "proper". It's better than the error message 'a' has no type at least.

[github-actions]

Thanks for your hard work on this PR!
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Hint: mm: orc; opt: speed; options: -d:release
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