feat(server): use nestjs events to validate config (#7986)

* use events for config validation

* chore: better types

* add unit tests

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

server/test/repositories/communication.repository.mock.ts

@@ -6,5 +6,7 @@ export const newCommunicationRepositoryMock = (): jest.Mocked<ICommunicationRepo
     broadcast: jest.fn(),
     on: jest.fn(),
     sendServerEvent: jest.fn(),
+    emit: jest.fn(),
+    emitAsync: jest.fn(),
   };
 };