[cxx-interop] [test] Disable failing executable test for protected special members (#86679)
This test fails on Linux and some simulator platforms as well. This test
was added in a35a0ad696533bc456ffdba5acc6202d181e7bf6 to test the work
there but is known to be broken prior to that (see PR testing in
#86389).
Disable this test until a forward fix is found. At this time it is not
known which platforms it fails on or why.
rdar://168302720