fix(接口测试): 修复复制的场景下子步骤添加同级步骤顺序错误的缺陷

--bug=1013543 --user=王孝刚
【接口测试】场景中含有复制/引用的场景-在复制/引用场景中添加场景断言后选中场景断言添加同级步骤-添加的步骤显示到了复制/引用的场景外面
https://www.tapd.cn/55049933/s/1167022

frontend/src/business/components/api/automation/scenario/menu/Menu.js

@@ -148,7 +148,11 @@ export function buttons(this_) {
 export function setNode(_this,node) {
   if(_this.selectedTreeNode !== undefined){
     if(_this.stepFilter.get("SpecialSteps").indexOf(_this.selectedTreeNode.type) !== -1){
-      _this.scenarioDefinition.splice(_this.selectedTreeNode.index,0,node);
+      if (_this.selectedNode.parent.data.hashTree) {
+        _this.selectedNode.parent.data.hashTree.splice(_this.selectedTreeNode.index, 0, node);
+      } else {
+        _this.scenarioDefinition.splice(_this.selectedTreeNode.index, 0, node);
+      }
       _this.$store.state.forceRerenderIndex = getUUID();
     }else{
       _this.selectedTreeNode.hashTree.push(node) ;