feat(AppConfig): iterate how apps are managed

- auth clients are always shared, cannot be disabled
- custom connections are enabled by default, can be disabled
- any existing connections can be reconnected regardless of its AppConfig or AppAuthClient states

packages/backend/src/controllers/api/v1/connections/reset-connection.test.js

@@ -47,7 +47,6 @@ describe('POST /api/v1/connections/:connectionId/reset', () => {
 
     const expectedPayload = resetConnectionMock({
       ...refetchedCurrentUserConnection,
-      reconnectable: refetchedCurrentUserConnection.reconnectable,
       formattedData: {
         screenName: 'Connection name',
       },