[opt](routine-load) do not schedule invalid task (#34918)

fe/fe-core/src/main/java/org/apache/doris/load/routineload/RoutineLoadTaskScheduler.java

@@ -123,6 +123,9 @@ public class RoutineLoadTaskScheduler extends MasterDaemon {
         }
 
         try {
+            if (routineLoadManager.getJob(routineLoadTaskInfo.getJobId()).isFinal()) {
+                return;
+            }
             // check if topic has more data to consume
             if (!routineLoadTaskInfo.hasMoreDataToConsume()) {
                 needScheduleTasksQueue.addLast(routineLoadTaskInfo);