Coach app requires an endpoint that returns the list of Regions a Coach belongs to

**Dependency**
AmericaScores-CoachApp

**Is your feature request related to a problem? Please describe.**
The Coach app needs to support different flows and filter the data according to the region a coach selects and needs an endpoint that retrieves the list of Regions a Coach belongs to, to create said flows in the app.

**Describe the solution you'd like**
An endpoint that retrieves all Regions a Coach belongs to in the latest Season