[Websocket] Websocket doesn't set the correct cluster data (#6102)

*Motivation*

Fixes #5997
Fixes #6079

A regression was introduced in #5486. If websocket service as running as part of
pulsar standalone, the cluster data is set with null service urls. This causes
service url is not set correctly in the pulsar client and an illegal argument exception
("Param serviceUrl must not be blank.") will be thrown.

*Modifications*

1. Pass `null` when constructing the websocket service. So the local cluster data can
   be refreshed when creating pulsar client.
2. Set the cluster data after both broker service and web service started and ports are allocated.

(cherry picked from commit 49a9897)

pulsar-broker/src/main/java/org/apache/pulsar/broker/PulsarService.java

@@ -427,9 +427,7 @@ public Boolean get() {
 
             if (config.isWebSocketServiceEnabled()) {
                 // Use local broker address to avoid different IP address when using a VIP for service discovery
-                this.webSocketService = new WebSocketService(
-                        new ClusterData(webServiceAddress, webServiceAddressTls, brokerServiceUrl, brokerServiceUrlTls),
-                        config);
+                this.webSocketService = new WebSocketService(null, config);
                 this.webSocketService.start();
 
                 final WebSocketServlet producerWebSocketServlet = new WebSocketProducerServlet(webSocketService);
@@ -466,6 +464,12 @@ public Boolean get() {
             this.brokerServiceUrl = brokerUrl(config);
             this.brokerServiceUrlTls = brokerUrlTls(config);
 
+            if (null != this.webSocketService) {
+                ClusterData clusterData =
+                    new ClusterData(webServiceAddress, webServiceAddressTls, brokerServiceUrl, brokerServiceUrlTls);
+                this.webSocketService.setLocalCluster(clusterData);
+            }
+
             // needs load management service
             this.startNamespaceService();
 

pulsar-websocket/src/main/java/org/apache/pulsar/websocket/WebSocketService.java

@@ -30,6 +30,7 @@
 import javax.servlet.ServletException;
 import javax.websocket.DeploymentException;
 
+import lombok.Setter;
 import org.apache.bookkeeper.common.util.OrderedScheduler;
 import org.apache.pulsar.broker.PulsarServerException;
 import org.apache.pulsar.broker.ServiceConfiguration;
@@ -77,6 +78,7 @@ public class WebSocketService implements Closeable {
     private ServiceConfiguration config;
     private ConfigurationCacheService configurationCacheService;
 
+    @Setter
     private ClusterData localCluster;
     private final ConcurrentOpenHashMap<String, ConcurrentOpenHashSet<ProducerHandler>> topicProducerMap;
     private final ConcurrentOpenHashMap<String, ConcurrentOpenHashSet<ConsumerHandler>> topicConsumerMap;