[ISSUE #10023] Remove duplicate shutdown and rejection handler calls for routeThreadPoolExecutor (#10024)

Author: Kris20030907

proxy/src/main/java/org/apache/rocketmq/proxy/grpc/v2/GrpcMessagingApplication.java

@@ -139,7 +139,6 @@ protected GrpcMessagingApplication(GrpcMessagingActivity grpcMessagingActivity,
     protected void init() {
         GrpcTaskRejectedExecutionHandler rejectedExecutionHandler = new GrpcTaskRejectedExecutionHandler();
         this.routeThreadPoolExecutor.setRejectedExecutionHandler(rejectedExecutionHandler);
-        this.routeThreadPoolExecutor.setRejectedExecutionHandler(rejectedExecutionHandler);
         this.producerThreadPoolExecutor.setRejectedExecutionHandler(rejectedExecutionHandler);
         this.consumerThreadPoolExecutor.setRejectedExecutionHandler(rejectedExecutionHandler);
         this.clientManagerThreadPoolExecutor.setRejectedExecutionHandler(rejectedExecutionHandler);
@@ -456,8 +455,6 @@ public void onCompleted() {
     @Override
     public void shutdown() throws Exception {
         this.grpcMessagingActivity.shutdown();
-
-        this.routeThreadPoolExecutor.shutdown();
         this.routeThreadPoolExecutor.shutdown();
         this.producerThreadPoolExecutor.shutdown();
         this.consumerThreadPoolExecutor.shutdown();