PubSubSinkTask.flush should flush tracking for all input partitions and only those partitions #306
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The existing behavior will only clear tracking for the first partition that throws an exception in flush. In cases where the partitions complete successfully, it will also clear tracking for partitions that it was not asked to flush. Both of these are not the expected behavior when implementing the interface. This pull requests fixes these two behaviors and adds tests that catch them in the old code and pass with the changes.