Fix live volume move tail timestamp (#8440)

* Improve move tail timestamp

* Add move tail timestamp integration test

* Simulate traffic during move

weed/shell/command_volume_copy.go

@@ -60,6 +60,6 @@ func (c *commandVolumeCopy) Do(args []string, commandEnv *CommandEnv, writer io.
 		return fmt.Errorf("source and target volume servers are the same!")
 	}
 
-	_, err = copyVolume(commandEnv.option.GrpcDialOption, writer, volumeId, sourceVolumeServer, targetVolumeServer, "", 0)
+	_, err = copyVolume(commandEnv.option.GrpcDialOption, writer, volumeId, sourceVolumeServer, targetVolumeServer, "", 0, true)
 	return
 }