fix:修改BUG

dashboard模块图表
1.tooltip去掉指定label功能去掉
2.图表高度调整
3.y轴刻度数值显示不全
4.metric的expert模式进行格式化，去掉空白字符
5.tooltip内容格式调整优化（一行显示，超出显示省略号，提示框显示位置等调整）

nezha-fronted/src/components/charts/chart-list.vue

@@ -9,12 +9,13 @@
   }
   .list-width{
     width:98%;
+    overflow-x:hidden;/*避免鼠标第一次放到曲线时，x轴出现滚动条后消失*/
   }
 </style>
 <template>
 
   <div class="list-width">
-    <div class="chartBox" v-for="(item, index) in dataList" :key="item.id">
+    <div class="chartBox" v-for="(item, index) in dataList" :key="item.id" :id="item.title+'_'+item.id">
 
       <line-chart-block v-if="item.type === 'line' || item.type === 'bar' || item.type === 4" :key="'inner' + item.id"
       ref="editChart" 

nezha-fronted/src/components/charts/line-chart-block.scss

@@ -2,10 +2,12 @@
 .clearfix:after{
   display: block;
   content: "";
+  height:0;
+  visibility:hidden;
   clear: both;
 }
 .clearfix{
-  margin-bottom: 20px;
+  //margin-bottom: 20px;
 }
 .legend-shape{
   display:inline-block;

nezha-fronted/src/components/page/dashboard/chartMetric.vue

@@ -275,6 +275,9 @@ export default {
       if (this.pointer === pointer) {
         this.$refs.elementInfo.validate((valid) => {
           if (valid) {//根据设置的rules进行验证，验证通过，则返回，继续进行保存（每个el-form-item都需要验证）
+            if(this.elementInfo.expression){
+              this.elementInfo.expression = this.elementInfo.expression.replace(/\s+| /ig,'');
+            }
             this.$emit('on-add-target-success', this.elementInfo, pointer);
           }
         });

nezha-fronted/src/components/page/dashboard/chartMetricForPreview.vue

@@ -304,6 +304,9 @@ export default {
     saveTarget() {
       this.$refs.elementInfo.validate((valid) => {
         if (valid) {
+          if(this.elementInfo.expression){
+            this.elementInfo.expression = this.elementInfo.expression.replace(/\s+| /ig,'');
+          }
           this.$emit('on-add-target-success', this.elementInfo);
         }
       });

nezha-fronted/src/components/page/dashboard/metricPreview.scss

@@ -23,8 +23,6 @@
   }
   .chart-preview-area {
     height: calc(100% - 180px);
-    overflow-y: auto;
-    overflow-x: hidden;
     position: relative
   }
   .common-detail-top-title {