C++ interop tests

[TEST ONLY] Enable `preview=in` by default #26936

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Run time

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Job	Run time
Run (macos-13, clang-13.0.0)	2m 45s
Run (macos-13, clang-12.0.0)	2m 27s
Run (macos-13, clang-11.0.0)	2m 47s
Run (macos-13, clang-10.0.0)	3m 45s
Run (macos-13, clang-9.0.0)	2m 49s
Run (macos-13, clang-8.0.0)	3m 19s
Run (ubuntu-20.04, clang-13.0.0)	1m 33s
Run (ubuntu-20.04, clang-12.0.0)	1m 31s
Run (ubuntu-20.04, clang-11.0.0)	1m 20s
Run (ubuntu-20.04, g++-11)	2m 55s
Run (ubuntu-20.04, g++-10)	2m 39s
Run (ubuntu-20.04, g++-9)	2m 42s
Run (windows-2019, msvc-2019)	1m 33s
	32m 5s