Remove Region from Program Data Model

[joneubank]

This ticket is part of the effort to add functionality of a Data Center Registry to the Program Service:
The Program Service scope is being expanded to also act as a Data Center Registry. Data Centers represent the Regional Data Processing Centers (RDPC) that ARGO will support a network of. Each program registered in the program-service must belong to a single Data Center. The Data Centers have various connection details that also need to be stored.

The Program entity no longer requires Region as this is being replaced by the Data Center entity and relationship. We want to remove the Region from the Program entity and the Region tables from the DB.

[joneubank]

These changes should not be introduced before: #413