MM 15187: Migrate "WebHook.DeleteOutgoing" to Sync by default (#10708)

* cherry commit for DeleteOutgoing and generate store mocks

* go fmt the code

app/channel.go

@@ -833,7 +833,7 @@ func (a *App) DeleteChannel(channel *model.Channel, userId string) *model.AppErr
 	}
 
 	for _, hook := range outgoingHooks {
-		if result := <-a.Srv.Store.Webhook().DeleteOutgoing(hook.Id, now); result.Err != nil {
+		if err := a.Srv.Store.Webhook().DeleteOutgoing(hook.Id, now); err != nil {
 			mlog.Error(fmt.Sprintf("Encountered error deleting outgoing webhook, id=%v", hook.Id))
 		}
 	}

app/webhook.go

@@ -536,11 +536,7 @@ func (a *App) DeleteOutgoingWebhook(hookId string) *model.AppError {
 		return model.NewAppError("DeleteOutgoingWebhook", "api.outgoing_webhook.disabled.app_error", nil, "", http.StatusNotImplemented)
 	}
 
-	if result := <-a.Srv.Store.Webhook().DeleteOutgoing(hookId, model.GetMillis()); result.Err != nil {
-		return result.Err
-	}
-
-	return nil
+	return a.Srv.Store.Webhook().DeleteOutgoing(hookId, model.GetMillis())
 }
 
 func (a *App) RegenOutgoingWebhookToken(hook *model.OutgoingWebhook) (*model.OutgoingWebhook, *model.AppError) {