fix(接口测试): 解决postman_har_jemeter接口用例场景导入没有用例等级问题

--user=郭雨琦
--bug=1014870
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001014870

backend/src/main/java/io/metersphere/api/service/ApiAutomationService.java

@@ -1439,6 +1439,9 @@ public class ApiAutomationService {
             if (item.getVersionId() == null || (!item.getVersionId().equals("new") && !item.getVersionId().equals("update"))) {
                 item.setNum(num);
             }
+            if (StringUtils.isBlank(item.getLevel())) {
+                item.setLevel("P0");
+            }
             if (BooleanUtils.isFalse(request.getOpenCustomNum())) {
                 // 如果未开启，即使有自定值也直接覆盖
                 item.setCustomNum(String.valueOf(num));

backend/src/main/java/io/metersphere/api/service/ApiDefinitionService.java

@@ -902,6 +902,10 @@ public class ApiDefinitionService {
                 apiTestCaseWithBLOBs.setToBeUpdateTime(apiDefinition.getToBeUpdateTime());
             }
 
+            if (StringUtils.isBlank(apiTestCaseWithBLOBs.getPriority())) {
+                apiTestCaseWithBLOBs.setPriority("P0");
+            }
+
             if (StringUtils.isNotBlank(apiTestCaseWithBLOBs.getId())) {
                 apiTestCaseMapper.updateByPrimaryKeyWithBLOBs(apiTestCaseWithBLOBs);
             } else {