refactor(性能测试): 版本更新不影响最新版本的选定

--bug=1020950--user=郭雨琦
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001020950

performance-test/backend/src/main/java/io/metersphere/service/PerformanceTestService.java

@@ -321,6 +321,9 @@ public class PerformanceTestService {
             loadTest.setCreateUser(SessionUtils.getUserId());
             loadTest.setOrder(oldLoadTest.getOrder());
             loadTest.setRefId(oldLoadTest.getRefId());
+            if (oldLoadTest.getLatest()) {
+                loadTest.setLatest(false);
+            }
             //插入文件
             copyLoadTestFiles(testId, loadTest.getId());
             loadTestMapper.insertSelective(loadTest);