NEZ-1973 fix：选择Metric时出现重影现象样式调整

nezha-fronted/src/assets/css/components/chart/chart.scss

@@ -3,9 +3,8 @@
 }
 .my-loading-parent--relative {
   position: relative;
-  display: inline-block;
   height: 100%;
-  width: 100%;
+  width: auto;
 }
 .panel-chart {
   border: 1px solid $--chart-box-border-color;

nezha-fronted/src/assets/css/components/page/dashboard/explore/promqlInput.scss

@@ -58,6 +58,7 @@
   }
   .el-cascader-menu {
     width: 200px;
+    height: 100%;
   }
   .metric-btn:hover, .metric-btn:focus {
     background-image:  linear-gradient(180deg, rgb(247, 248, 250) 0%, rgb(247, 248, 250) 100%);

nezha-fronted/src/components/page/dashboard/explore/promqlInput.vue

@@ -23,7 +23,6 @@
               v-model="cascaderValue"
               v-clickoutside="closeDropdown"
               v-my-loading="tempBoxShowLoading"
-              :loading="loading"
               :options="metricOptions"
               v-if="type !== 'log'"
               :props="cascaderProps"
@@ -925,7 +924,7 @@ export default {
             let childrenCopy = JSON.parse(JSON.stringify(children))
             const findChild = this.metricOptions.find(item => item.label === data.parent)
             if (childrenCopy.length > 100) {
-              childrenCopy = childrenCopy.splice(findChild.children.length, findChild.children.length + 101)
+              childrenCopy = childrenCopy.splice(findChild.children.length, 100)
               findChild.children.splice(findChild.children.length - 1, 1)
               findChild.children.push(...childrenCopy)
               if (findChild.children.length < children.length - 1) {