fix(接口场景): 引用 case 后新建自定义请求数据问题修复

frontend/src/views/api-test/scenario/components/common/customCaseDrawer.vue

@@ -968,7 +968,7 @@
   function handleClose() {
     if (isReplace.value) {
       isReplace.value = false;
-    } else {
+    } else if (!requestVModel.value.isNew) {
       emit('applyStep', cloneDeep(makeRequestParams()) as RequestParam);
     }
   }

frontend/src/views/api-test/scenario/components/step/stepTree.vue

@@ -1240,6 +1240,7 @@
         if (_stepType.isQuoteCase && !realStep.isQuoteScenarioStep) {
           realStep.name = request.stepName || request.name;
           stepDetails.value[realStep.id] = request; // 为了设置一次正确的polymorphicName
+          activeStep.value = undefined;
           return;
         }
       }