Manifest process should execute in parallel to manage Item batch

Summary:

Business users submit multiple big files ( 10k records in each file in average) using Manifest process. In daily business process, Business users use Manage Batch to import data for creation or update. Since Manifest and Manage Item Batch use the same Import Job, the waiting time in queue increase.

So, manifest process should execute separate Item Import job, not in same queue where Manage Item Batch submit the job.

Now, since both process manifest and manage item batch use the same queue, users need to wait sometime whole day to see their item update.

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