OZP-807: Useful Backend Legacy service for translating widgets and dashboards between OWF 8- and 7-compatible objects.
& OZP-783: Implement user services for admin widgets
& OZP-784: Implement group services for admin widgets
& OZP-787: Implement stacks services for admin widgets

1. Added methods to translate groups, stacks, persons, and widget definitions from OWF 7-compatible maps to OWF 8 domain objects, along with tests for each.