[9.2] Fix race condition in async task reschedule test (#137405) #137447
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When rescheduling a task, the task may begin running before the test is able to take more actions. This means reseting the barriers in the auto reschedule test may occur after the second run of the task has begun, which results in a broken barrier. This commit fixes the race condition by moving the reset of each barrier to occur after the await for the relevant barrier. This ensures that each barrier is ready to be awaited on again by the end of the run. Due to there being two barriers, the second barrier may be reset after the test codes second barrier1.await, but that is ok. closes elastic#131150
rjernst
added
:Core/Infra/Core
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Backports the following commits to 9.2: