refactor(stream): disable error injection.

source/libs/stream/src/streamExec.c

@@ -824,10 +824,10 @@ static int32_t doStreamExecTask(SStreamTask* pTask) {
     // dispatch checkpoint msg to all downstream tasks
     int32_t type = pInput->type;
     if (type == STREAM_INPUT__CHECKPOINT_TRIGGER) {
-
+#if 0
       // Injection error: for automatic kill long trans test
       taosMsleep(50*1000);
-
+#endif
       code = streamProcessCheckpointTriggerBlock(pTask, (SStreamDataBlock*)pInput);
       if (code != 0) {
         stError("s-task:%s failed to process checkpoint-trigger block, code:%s", pTask->id.idStr, tstrerror(code));