[8.x] Handle rejection in DriverScheduler (#122105) #122117
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When a node is shutting down, scheduling tasks for the Driver can result in a rejection exception. In this case, we drain and close all operators. However, we don't clear the pending tasks in the scheduler, which can lead to a pending task being triggered unexpectedly, causing a ConcurrentModificationException.
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Backports the following commits to 8.x: