Allow users to create more than one work item in one workflow

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Problem to solve

In #418133[Create.png] (comment 1540140691) the expectation for a "save and create another" method was raised. Users can currently do this in some contexts, such as when creating an item from child items. We know from customers that in some contexts users want to create >1 item at once, such as to scaffold an epic with expected issues.

As this isn't always the expected behavior this should be opt-in, allowing users to either create many or just stop at one.

Acceptance criteria

• As a user I can enable "Create more" by checking a checkbox
• When "Create more" is enabled, and I create one item...
  • The create form remains open
  • A toast message for the created item is shown (may overlay modal temporarily, must be above modal background)
  • All attributes except title and description remain populated for the new item
  • "Create more" remains enabled unless manually disabled by checking off, or closing the modal/canceling
• "Create more" is always defaulted off when initially opening the creation form.