When upgrading from older versions, service names changed from
placeholder IDs (forward_user_0) to real user_tunnel IDs, causing
service not found errors during control operations.
- Add fallback cleanup+rebuild logic on UpdateService when service
not found during the upgrade transition period.
- Add self-healing retry on Pause/Resume when all variants are missing.
- Refactor controlForwardServicesOnNode to support unit testing.
- Add tests for shouldSelfHealForwardServiceControl and
controlForwardServiceCommand helper functions.
Entire-Checkpoint: a7f0c3175d06
sagitchu