fix(性能测试): 修复场景批量转成性能测试时重复导入的问题

--bug=1016621 --user=刘瑞斌 【接口测试】github#17739，批量接口自动化转化性能测试会多次重复导入 https://www.tapd.cn/55049933/s/1251897

Closes #17739

frontend/src/business/components/performance/test/EditPerformanceTest.vue

@@ -260,16 +260,12 @@ export default {
             scenarioJmxs.jmxs.forEach(item => {
               if (item.scenarioId) {
                 this.$refs.basicConfig.importScenario(item.scenarioId);
-                this.$refs.basicConfig.handleUpload();
                 relateApiList.push({
                   apiId: item.scenarioId,
                   apiVersion: item.version,
                   type: 'SCENARIO'
                 });
               }
-              if (item.caseId) {
-                this.$refs.basicConfig.importCase(item);
-              }
               if (JSON.stringify(item.attachFiles) !== "{}") {
                 let attachFiles = [];
                 for (let fileID in item.attachFiles) {
@@ -278,6 +274,7 @@ export default {
               }
               this.$set(this.test, "apiList", relateApiList);
             });
+            this.$refs.basicConfig.handleUpload();
             this.active = '1';
             this.$store.commit("clearScenarioJmxs");
           }