ShutdownOnCriticalIOErrorMoveNextTest was actually my "inspiration" to have created the isolated tests module in the first place, so it would be reasonable to move it there as well.
the issue comes down to the test simulating a server failure where the server would go down abruptly causing the VM to drop / exit. In this test the nature of failure is leaving a partial shutdown where server executors are still hanging around causing a cascade leak of server pools still running.
So it is completely expected to have these threads "leaking". Hence this test should be moved into the isolated-tests.
there is no semantic / server change as part of this task. It's just moving a test to a better place.
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