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Fail async tests if not ended before event loop empties

Rather than keeping an infinite timer open, waiting for `t.end()` to be
called, fail the callback test if it is not ended when the event loop
empties.

Similarly, fail promise/observable returning tests if the promise hasn't
fulfilled or the observable hasn't completed when the event loop
empties.

Note that user code can keep the event loop busy, e.g. if it's listening
on a socket or starts long timers. Even after this change, async tests
may hang if the event loop is kept busy.

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