APPROVALS: Fix approval flow RESET problem

Current Situation: All items in the approval flow fully reset to stage 1 if any modification to the approval rule is made (even if the modification does not invalidate the existing approval stages).

Example: Approval stage 3 is modified to add an additional approver. Even if only 1 approver is needed, all items at this stage or beyond, fully reset all the way back to stage 1, forcing previous approvers to re-approve again.

Desired Function: (see Request #1095835 for full discussion). Item within an approval flow only resets if a completed approval stage is actually invalidated, such as:

• A person is added and all approval votes are required
• The person who had approved was removed from the stage leaving no valid approval on a stage).

If a reset does happen, it only resets to the invalidated stage, not to the beginning.