enh(stream): add more check to stop stream asap.

source/dnode/vnode/src/tq/tqRestore.c

@@ -96,7 +96,7 @@ int32_t doCreateReqsByScanWal(SStreamMeta* pStreamMeta, STqOffsetStore* pOffsetS
       continue;
     }
 
-    if (pTask->taskLevel != TASK_LEVEL__SOURCE) {
+    if ((pTask->taskLevel != TASK_LEVEL__SOURCE) || (pTask->status.taskStatus == TASK_STATUS__DROPPING)) {
       streamMetaReleaseTask(pStreamMeta, pTask);
       continue;
     }

source/libs/stream/src/streamExec.c

@@ -368,7 +368,7 @@ int32_t streamTryExec(SStreamTask* pTask) {
     atomic_store_8(&pTask->status.schedStatus, TASK_SCHED_STATUS__INACTIVE);
     qDebug("s-task:%s exec completed", pTask->id.idStr);
 
-    if (!taosQueueEmpty(pTask->inputQueue->queue)) {
+    if (!taosQueueEmpty(pTask->inputQueue->queue) && (pTask->status.taskStatus != TASK_STATUS__DROPPING)) {
       streamSchedExec(pTask);
     }
   }