[Epic] Test migration from Pulp 2 to Pulp 3
Test - Pulp 2 stops working after installing Pulp 3
Parent task: Test #5194
Test - As a user, I can use the REST API to dispatch a Pulp 2 to 3 migration task.
As a user, I can migrate content for a specific Pulp3 plugin
As a user, I can check the progress of migration
As a user, I can stop and resume migration process
Create a set of tests to run with every PR for the migration plugin