fix(接口测试): 修复历史断言数据兼容问题

--bug=1011386 --user=赵勇 【接口测试】有个场景调试整个场景报错，关闭场景console也报错 https://www.tapd.cn/55049933/s/1122341

backend/src/main/java/io/metersphere/api/dto/definition/request/ElementUtil.java

@@ -697,7 +697,7 @@ public class ElementUtil {
                 elementList.addAll(groupMap.get(POST).stream().sorted(Comparator.comparing(MsTestElement::getIndex)).collect(Collectors.toList()));
             }
             if (CollectionUtils.isNotEmpty(groupMap.get(ASSERTIONS))) {
-                elementList.addAll(groupMap.get(ASSERTIONS).stream().sorted(Comparator.comparing(MsTestElement::getIndex)).collect(Collectors.toList()));
+                elementList.addAll(groupMap.get(ASSERTIONS));
             }
         }
         return elementList;

frontend/src/business/components/api/definition/components/step/JmxStep.vue

@@ -18,8 +18,7 @@
           :value="item.id">
         </el-option>
       </el-select>
-      <el-button size="mini" @click="add" type="primary" v-if="tabType !== 'assertionsRule'"
-                 :disabled="request.disabled">
+      <el-button size="mini" @click="add" type="primary" v-if="tabType !== 'assertionsRule'">
         {{ $t('api_test.request.assertions.add') }}
       </el-button>
     </p>