fix(接口测试): 文档结构增加移除功能

--bug=1008049 --user=赵勇 【接口测试】文档结构断言没有删除按钮 https://www.tapd.cn/55049933/s/1070011

frontend/src/business/components/api/definition/components/assertion/ApiAssertionsEdit.vue

@@ -57,7 +57,10 @@
         :edit="true"/>
     </div>
     <div class="assertion-item-editing response-time" v-if="isDocument">
-      <div> {{ assertions.document.type }}-{{ $t("api_test.definition.request.document_structure") }}</div>
+      <div>
+        {{ assertions.document.type }}-{{ $t("api_test.definition.request.document_structure") }}
+        <el-button :disabled="isReadOnly" type="danger" size="mini" icon="el-icon-delete" circle @click="remove" style="float: right"/>
+      </div>
       <ms-document-body :document="assertions.document" :apiId="apiId"/>
     </div>
   </div>
@@ -112,6 +115,9 @@ export default {
     }
   },
   methods: {
+    remove() {
+      this.assertions.document = {type: "JSON", data: {xmlFollowAPI: false, jsonFollowAPI: false, json: [], xml: []}};
+    },
     reload() {
       this.loading = true
       this.$nextTick(() => {

frontend/src/business/components/api/definition/components/assertion/document/DocumentBody.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="ms-border">
+  <div class="ms-border" style="margin-top: 10px">
     <div style="margin-bottom: 10px">
       <span class="ms-import" @click="importData">
          <i class="el-icon-edit-outline" style="font-size: 16px"/>

frontend/src/business/components/api/definition/components/assertion/document/DocumentHeader.vue

@@ -8,8 +8,7 @@
         </el-select>
       </el-col>
       <el-col class="assertion-btn">
-        <el-button :disabled="isReadOnly" type="danger" size="mini" icon="el-icon-delete" circle @click="remove" v-if="edit"/>
-        <el-button :disabled="isReadOnly" type="primary" size="small" @click="add" v-else>
+        <el-button :disabled="isReadOnly" type="primary" size="small" @click="add">
           {{ $t('api_test.request.assertions.add') }}
         </el-button>
       </el-col>