fix(api): 修复latest_op_ts无法记录

mysql的greatest函数，null永远是最大值

service-command/src/main/java/com/lanyuanxiaoyao/service/command/commands/YarnCommand.java

@@ -297,8 +297,4 @@ public class YarnCommand extends AbstractUtilShellComponent {
                 ) : ""
         );
     }
-
-    @ShellMethod("test")
-    public void test() {
-    }
 }