fix: Remove unused class (#5833)

Co-authored-by: Nwen-hemin <wenhemin@apache.com>

dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/utils/RemoveZKNode.java

-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.dolphinscheduler.server.utils;
-
-import org.apache.dolphinscheduler.service.registry.RegistryClient;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.boot.CommandLineRunner;
-import org.springframework.boot.WebApplicationType;
-import org.springframework.boot.builder.SpringApplicationBuilder;
-import org.springframework.context.annotation.ComponentScan;
-
-@ComponentScan("org.apache.dolphinscheduler")
-public class RemoveZKNode implements CommandLineRunner {
-
-    private static final Integer ARGS_LENGTH = 1;
-
-    private static final Logger logger = LoggerFactory.getLogger(RemoveZKNode.class);
-
-    /**
-     * zookeeper operator
-     */
-    private RegistryClient registryClient = RegistryClient.getInstance();
-
-    public static void main(String[] args) {
-        new SpringApplicationBuilder(RemoveZKNode.class).web(WebApplicationType.NONE).run(args);
-    }
-
-    @Override
-    public void run(String... args) throws Exception {
-        if (args.length != ARGS_LENGTH) {
-            logger.error("Usage: <node>");
-            return;
-        }
-
-        registryClient.remove(args[0]);
-        registryClient.close();
-    }
-}