[autoscaler] Fix test heartbeats single test #12513
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ericl
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Why are these changes needed?
Closes #9484
It turns out this test was always broken, and only sometimes passed due to a race condition where the heartbeats weren't updated yet. We no longer acquire resources on method execution, so the num_cpus have to be set in the class decorator for this test to pass. Adding the sleep(1) causes the test to fail deterministically without the decorator.