Return resourceversion too old error to UI instead of logging (#667)

* Return watch error instead of logging it

The UI needs to know about watch error like `resourceversion too old` so
we need to return it.

* Sort by resourceVersion as number

The UI makes some assumption on resourceVersion. It assumes they are a
number and they are ordered by the number value. We'll want to fix this
at some point most likely but for now let's give something in a way that
UI wants.

* Remove -d suffix

After much testing, a delete of an object seems to have its own
resourceVersion so we don't need the -d suffix, we can simply use the
new resourceVersion.

pkg/stores/sqlproxy/proxy_store.go

@@ -564,6 +564,8 @@ func (s *Store) watch(apiOp *types.APIRequest, schema *types.APISchema, w types.
 
 	result := make(chan watch.Event)
 	go func() {
+		defer close(result)
+
 		ctx := apiOp.Context()
 		idNamespace, _ := kv.RSplit(w.ID, "/")
 		if idNamespace == "" {
@@ -580,10 +582,10 @@ func (s *Store) watch(apiOp *types.APIRequest, schema *types.APISchema, w types.
 		}
 		err := inf.ByOptionsLister.Watch(ctx, opts, result)
 		if err != nil {
-			logrus.Error(err)
+			returnErr(err, result)
+			return
 		}
 		logrus.Debugf("closing watcher for %s", schema.ID)
-		close(result)
 	}()
 	return result, nil
 }