[6.2][cxx-interop] Fix passing optional CoreFoundation types from Swift to C++ #84077
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Explanation: These types are passed around as reference counted pointers, so the optional representation of them are nullable pointers. Previously, we tried to wrap them in swift::Optional.
Issues: rdar://157667946
Original PRs: #83609
Risk: Low, the fix is narrow.
Testing: Added a compiler test.
Reviewers: @hnrklssn