Remove unused CSS (#26714)

frontend/src/metabase/css/core/grid.css

-:root {
-}
-
 .Grid {
   display: flex;
   flex-wrap: wrap;

frontend/src/metabase/visualizations/components/FunnelNormal.css

@@ -53,9 +53,6 @@
   font-size: 16px;
 }
 
-:local .Infos .Title {
-}
-
 :local .Infos .Subtitle {
   font-size: 0.6875em;
   margin-top: 1em;

frontend/src/metabase/visualizations/visualizations/PieChart/PieChart.css

-:local .ChartAndDetail {
-}
-
 :local .Chart,
 :local .Detail {
   position: absolute;

frontend/src/metabase/visualizations/visualizations/PieChart/PieChart.jsx

@@ -506,7 +506,7 @@ export default class PieChart extends Component {
         showLegend={settings["pie.show_legend"]}
         isDashboard={this.props.isDashboard}
       >
-        <div className={styles.ChartAndDetail}>
+        <div>
           <div ref={this.chartDetail} className={styles.Detail}>
             <div
               data-testid="detail-value"