fix(接口测试): tfs平台缺陷模板添加自定义字段 同步问题处理

--bug=1012110 --user=zhaoqian
用户在tfs平台自定义缺陷模板，添加自定义字段，无法同步到ms的问题处理

backend/src/main/java/io/metersphere/track/issue/domain/azure/AzureDevopsWorkItemsBatchResponse.java

@@ -1,5 +1,6 @@
 package io.metersphere.track.issue.domain.azure;
 
+import com.alibaba.fastjson.JSONObject;
 import com.alibaba.fastjson.annotation.JSONField;
 import lombok.Getter;
 import lombok.Setter;
@@ -19,32 +20,14 @@ public class AzureDevopsWorkItemsBatchResponse {
     public class Value {
         private int id;
         private int rev;
-        private Fields fields;
+        private JSONObject fields;
         private String url;
 
-        @Getter
-        @Setter
-        public class Fields {
-            @JSONField(name = "System.Id")
-            private int systemId;
-            @JSONField(name = "System.WorkItemType")
-            private String systemWorkItemType;
-            @JSONField(name = "System.Title")
-            private String systemTitle;
-            @JSONField(name = "System.State")
-            private String state;
-            @JSONField(name = "System.Description")
-            private String description;
-            @JSONField(name = "System.AssignedTo")
-            private String assignedTo;
-            @JSONField(name = "System.ChangedBy")
-            private String changedBy;
-            @JSONField(name = "System.CreatedBy")
-            private String createdBy;
-            @JSONField(name = "Microsoft.VSTS.TCM.ReproSteps")
-            private String reproSteps;
-            @JSONField(name = "System.CreatedDate")
-            private String createdDate;
+        public String getFieldsValue(String name) {
+            if (fields != null && fields.containsKey(name)) {
+                return fields.getString(name);
+            }
+            return "";
         }
     }
 }