Issue Summary

When deleting a status which has an approval configured from a workflow, open work items that were previously on that deleted status will have approvals that are unresolvable. They will permanently show on "Waiting for my approval" in the portal, for approvers that were on that approval.  

Is a root cause for https://getsupport.atlassian.com/browse/JST-1174779 (can't link directly)

Steps to Reproduce

1. Have a workflow with approval on status A
2. Have work items currently open on status A
3. Delete status A from your workflow, where you are met with a modal to transition all open work items to another status
4. Save workflow

Expected Results

The approval should be cancelled, should show in the work item history as cancelled, and the work item should not appear under "Waiting for my approval" in the portal for any approvers that were on the affected work items. 

Actual Results

Approval is permanently unresolvable, and the affected work items configured approvers will see the work item under "Waiting for my approval" in the portal. 

Workaround

To stop the work item appearing under "Waiting for my approval", remove affected approvers from the previously configured approvers source field.