Task count should be updated as soon as task items are loaded.

[DerekStrickland]

Describe the bug

If TaskProvider::complete fails, the Task record is never updated with the count of items.

• TaskProviders share a lifecycle defined by the trait, with one main section of variable logic.
• Specifically, they vary on how they query for the batch items to process and how they process each item.
• The TaskProvider trait provides default logic for inserting a Task record when a Task starts, and for updating it with summary statistics and error logging when a Task ends.
• Unfortunately, if the update at the end fails, the count field never gets updated.
• This is useful information to have when debugging, and the Task should get updated with a count as soon as that information is available.

To Reproduce

Run any task locally and stop it before it completes.

Expected behavior

The Task document's count field should be updated in each task, as soon as the primary batch query successfully retrieves the set of items to process.

[sbolel]

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