[MM-15120] Migrate PermanentDeleteIncomingByChannel to Sync (#10677)

* Migrate PermanentDeleteIncomingByChannel to Sync

* fix err

store/sqlstore/webhook_store.go

@@ -164,15 +164,15 @@ func (s SqlWebhookStore) PermanentDeleteIncomingByUser(userId string) store.Stor
 	})
 }
 
-func (s SqlWebhookStore) PermanentDeleteIncomingByChannel(channelId string) store.StoreChannel {
-	return store.Do(func(result *store.StoreResult) {
-		_, err := s.GetMaster().Exec("DELETE FROM IncomingWebhooks WHERE ChannelId = :ChannelId", map[string]interface{}{"ChannelId": channelId})
-		if err != nil {
-			result.Err = model.NewAppError("SqlWebhookStore.DeleteIncomingByChannel", "store.sql_webhooks.permanent_delete_incoming_by_channel.app_error", nil, "id="+channelId+", err="+err.Error(), http.StatusInternalServerError)
-		}
+func (s SqlWebhookStore) PermanentDeleteIncomingByChannel(channelId string) *model.AppError {
+	_, err := s.GetMaster().Exec("DELETE FROM IncomingWebhooks WHERE ChannelId = :ChannelId", map[string]interface{}{"ChannelId": channelId})
+	if err != nil {
+		return model.NewAppError("SqlWebhookStore.DeleteIncomingByChannel", "store.sql_webhooks.permanent_delete_incoming_by_channel.app_error", nil, "id="+channelId+", err="+err.Error(), http.StatusInternalServerError)
+	}
 
-		s.ClearCaches()
-	})
+	s.ClearCaches()
+
+	return nil
 }
 
 func (s SqlWebhookStore) GetIncomingList(offset, limit int) ([]*model.IncomingWebhook, *model.AppError) {