KAFKA-10199: Accept only one task per exception in queue for failed tasks #15849
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Currently, the state updater writes multiple tasks per exception in the output queue for failed tasks. To add the functionality to remove tasks synchronously from the state updater, it is simpler that each element of the output queue for failed tasks holds one single task.
This commit refactors the class that holds exceptions and failed tasks in the state updater -- i.e., ExceptionAndTasks -- to just hold one single task.
Committer Checklist (excluded from commit message)