[Bug] missing brokerName in sendMessageBack request

[yuz10]

Before Creating the Bug Report

• I found a bug, not just asking a question, which should be created in GitHub Discussions.

• I have searched the GitHub Issues and GitHub Discussions of this repository and believe that this is not a duplicate.

• I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ.

Runtime platform environment

Ubuntu 24.04

RocketMQ version

5.3.0

JDK Version

1.8

Describe the Bug

issue #3905 adds brokerName in remoting protocol, but in sendMessageBack request, the brokerName is missing.

when request proxy, and the broker address is not available in network, the consumer cannot send message back.

Steps to Reproduce

start a consumer that returns RECONSUME_LATER

        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("group");

        consumer.setNamesrvAddr("localhost:8080");

        consumer.subscribe("topic", "*");
        consumer.registerMessageListener(new MessageListenerConcurrently() {

            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                return ConsumeConcurrentlyStatus.RECONSUME_LATER;
            }
        });

What Did You Expect to See?

send message back request contains brokerName.

What Did You See Instead?

brokerName is null in send message back request.

Additional Context

No response