MM-62751: [Shared Channels] Allow remote users to be discoverable in the create DM/GM modal (#30918)

server/channels/store/retrylayer/retrylayer.go

@@ -9998,6 +9998,27 @@ func (s *RetryLayerRemoteClusterStore) Update(rc *model.RemoteCluster) (*model.R
 
 }
 
+func (s *RetryLayerRemoteClusterStore) UpdateLastGlobalUserSyncAt(remoteID string, syncAt int64) error {
+
+	tries := 0
+	for {
+		err := s.RemoteClusterStore.UpdateLastGlobalUserSyncAt(remoteID, syncAt)
+		if err == nil {
+			return nil
+		}
+		if !isRepeatableError(err) {
+			return err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
 func (s *RetryLayerRemoteClusterStore) UpdateTopics(remoteClusterID string, topics string) (*model.RemoteCluster, error) {
 
 	tries := 0