fix(测试跟踪): 依赖关系图页面在窗口较小的情况下，头部按钮显示不全

--bug=1025875 --user=陈建星 【接口测试】接口定义、接口场景，单独和批量生成依赖关系，没有关闭按钮 https://www.tapd.cn/55049933/s/1369233
--bug=1025894 --user=陈建星 【测试跟踪】功能用例详情中查看依赖关系，没有关闭按钮 https://www.tapd.cn/55049933/s/1369232

framework/sdk-parent/frontend/src/components/graph/RelationshipGraph.vue

@@ -10,12 +10,11 @@
 
 <script>
 import MsDrawer from "../MsDrawer";
-import DrawerHeader from "../head/DrawerHeader";
 import MsChart from "../chart/MsChart";
 
 export default {
   name: "RelationshipGraph",
-  components: {MsChart, DrawerHeader, MsDrawer},
+  components: {MsChart, MsDrawer},
   props: {
     data: Array, links: Array,
     width: [Number, String],

framework/sdk-parent/frontend/src/components/graph/RelationshipGraphDrawer.vue

@@ -1,7 +1,7 @@
 <template>
   <el-drawer :visible="visible" append-to-body>
     <ms-drawer :size="85" @close="close" direction="right" :show-full-screen="false"
-               :is-show-close="false" style="height: auto">
+               :is-show-close="false" style="height: auto" ref="msDrawer">
       <template v-slot:header>
         <drawer-header :title="$t('commons.relationship.graph')" @close="close" @export="exportCharts"/>
       </template>
@@ -77,6 +77,9 @@ export default {
           this.$refs.relationshipGraph.reload();
         });
       });
+      if (this.$refs.msDrawer) {
+        this.$refs.msDrawer.init();
+      }
     },
     handleFinished() {
       // 滚动条设置居中

framework/sdk-parent/frontend/src/components/head/DrawerHeader.vue

@@ -6,12 +6,7 @@
           <span class="title">{{ title }}</span>
         </div>
       </el-col>
-      <el-col :span="10" class="head-right">
-        <el-button v-for="button in buttons" :disabled="button.disabled" :key="button.name" plain size="mini" @click="button.exec">
-          {{ button.name }}
-        </el-button>
-      </el-col>
-      <el-col :span="4">
+      <el-col :span="14">
         <div class="ms-export">
           <el-dropdown style="padding-left: 3rem">
             <span class="el-dropdown-link">
@@ -136,11 +131,11 @@ i.delimiter {
   position: relative;
   top: -2px;
   left: 15px;
+  padding-right: 10px;
 }
 
 .ms-export {
   float: right;
-  width: 100%;
 }
 
 .close-btn {