[ISSUE #9294] Proxy compatible batch message (#9295)

Author: gaoyf

proxy/src/main/java/org/apache/rocketmq/proxy/remoting/activity/AbstractRemotingActivity.java

@@ -63,7 +63,7 @@ public AbstractRemotingActivity(RequestPipeline requestPipeline, MessagingProces
     protected RemotingCommand request(ChannelHandlerContext ctx, RemotingCommand request,
         ProxyContext context, long timeoutMillis) throws Exception {
         String brokerName;
-        if (request.getCode() == RequestCode.SEND_MESSAGE_V2) {
+        if (request.getCode() == RequestCode.SEND_MESSAGE_V2 || request.getCode() == RequestCode.SEND_BATCH_MESSAGE) {
             if (request.getExtFields().get(BROKER_NAME_FIELD_FOR_SEND_MESSAGE_V2) == null) {
                 return RemotingCommand.buildErrorResponse(ResponseCode.VERSION_NOT_SUPPORTED,
                     "Request doesn't have field bname");