Fix ThreadPerTaskScheduler busyness accounting #3859
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This change prevents the same `BoundedElasticThreadPerTaskScheduler` being picked up when the maximum number of Virtual Threads are already being executed in parallel. The consequence of improper busyness accounting was that tasks were executed sequentially instead of being run in parallel because the same `Worker` was being picked by operators. Resolves #3857
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This change prevents the same
BoundedElasticThreadPerTaskSchedulerbeing picked up when the maximum number of Virtual Threads are already being executed in parallel. The consequence of improper busyness accounting was that tasks were executed sequentially instead of being run in parallel because the sameWorkerwas being picked by operators.Resolves #3857