fix(接口测试): 修复环境断言中html断言失败的缺陷

--bug=1031004 --user=王孝刚 【接口测试】引用环境全局断言path-html-断言失败
https://www.tapd.cn/55049933/s/1419144

api-test/backend/src/main/java/io/metersphere/api/dto/scenario/environment/item/EnvAssertions.java

@@ -23,4 +23,5 @@ public class EnvAssertions extends BaseEnvElement {
     private MsAssertionDuration duration;
     private String type = ElementConstants.ASSERTIONS;
     private MsAssertionDocument document;
+    private String xpathType;
 }