Fix for intermittent Windows failures, see #22628 #22648
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The Windows failures in #22628 are caused by leftover threads blocking
stdtest.exe; in both of these tests a thread is spawned that may outlive the main thread. We can't use a scoped thread here because these both test the behavior of panics in spawned threads, and with scoped threads we cannot panic the child without the parent panicking too.A twenty-second sleep for Windows ensures that the spawned thread will have exited.
This is only temporary (and is very much a hack), we probably should find a better solution to the issue of exes being blocked because they are in use, perhaps via the test runner.