This migration adds "Storage Locations", managed via a new System Administration panel, that can hold Station Media data, live broadcast recordings, and backups. These storage locations can be local (as they are by default) or remote via any S3-compatible service.
- Switch to EntityManagerInterface for EM uses
- Wrap EntityManager in close-resilient wrapper
- Close/clear/reopen EM with every request
- Rework tests to be em->clear() resilient.