[AC-1608] Send offboarding survey response to Stripe on subscription cancellation (#3734)

* Added offboarding survey response to cancellation when FF is on.

* Removed service methods to prevent unnecessary upstream registrations

* Forgot to actually remove the injected command in the services

* Rui's feedback

* Add missing summary

* Missed [FromBody]

src/Api/Startup.cs

@@ -171,6 +171,7 @@ public class Startup
         services.AddOrganizationSubscriptionServices();
         services.AddCoreLocalizationServices();
         services.AddBillingCommands();
+        services.AddBillingQueries();
 
         // Authorization Handlers
         services.AddAuthorizationHandlers();