Allow viewing and canceling imports in progress

I... *think* it still makes sense to mark it as canceled?

It's unclear what canceling does or means when you cancel an import whose verification has completed.
I would certainly find it to be surprising behaviour if I clicked cancel but would only change the status if we still verifying the import (and we could switch from "Verifiying" to "Verification Completed" **during** a user's attempt to cancel the import).