Remove calls to registry migration workers and update to no-op
What does this MR do and why?
In this MR, we remove the calls to the migration workers and update them to no-op.
Migration workers under app/workers/container_registry/migration/
:
- EnqueuerWorker
- GuardWorker
- ObserverWorker
This is the first step to removing workers as per our guideline. In the next minor release, we would remove the worker files.
MR acceptance checklist
Related to #409873
Edited by Adie (she/her)