[6.2][cxx-interop] Fix not importing return type for certain functions #80585
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Explanation: Fixes that functions imported from C++ namespaces are taking a different code path than functions importing from the global namespace. This also fixes an error where the return type of a templated function is sometimes not imported.
Scope: C++ forward interop.
Issue: rdar://148735986
Risk: Low, the fix is targeted to make C++ functions in namespaces take a well tested code path that we already use for C++ functions in the global scope.
Testing: Added tests to test suite
Reviewer: @j-hui