Exhaustively iterate ColumnarToRow iterator to avoid leaks #4428
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Fixes #4422. ColumnarToRowIterator will close its current batch via a task completion listener, but during unit tests there is no task context to leverage and thus the test must ensure the iterator is exhausted to ensure the batch is closed. In each of these cases the iterator was almost exhausted, but it was lacking a final
hasNextto trigger the batch closing. Arguably this was a missed check in each of these tests anyway.