Provide a task executor to use when constructing a {@link PartitionHandler} from the {@link #step(Step)}. Mainly used for running a step locally in parallel, but can be used to execute remotely if the step is remote. Not used if an explicit {@link #partitionHandler(PartitionHandler)} is provided.
@param taskExecutor a task executor to use when executing steps in parallel
@return this for fluent chaining
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