[6.2][cxx-interop] Fix a rare compilation error in reverse interop header #80631
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Explanation: Fix a compilation error in the generated reverse interop header when a nested foreign type is used in a generic context and it is reexposed to C++.
Issue: rdar://148597079
Risk: Low, the fix is fairly targeted to the affected scenario.
Testing: Added tests to test suite
Original PR: #80598
Reviewer: @egorzhdan