[cxx-interop] Enable reference-counted types on Windows
This enables the use of reference-counted foreign reference types on Windows. As it turns out, the assertion that was failing on Windows previously was unnecessary. This also enabled many of the tests on Windows.
rdar://154694125 / resolves https://github.com/swiftlang/swift/issues/82643
(cherry picked from commit b440c4ff708ce352460800d461a98be6f30fdac7)
