Chore: Remove not used PanelOptionsGrid component (#30358)

packages/grafana-ui/src/components/PanelOptionsGrid/PanelOptionsGrid.tsx

-import React, { SFC } from 'react';
-
-interface Props {
-  cols?: number;
-  children: JSX.Element[] | JSX.Element;
-}
-
-export const PanelOptionsGrid: SFC<Props> = ({ children }) => {
-  return <div className="panel-options-grid">{children}</div>;
-};

packages/grafana-ui/src/components/PanelOptionsGrid/_PanelOptionsGrid.scss

-.panel-options-grid {
-  display: grid;
-  grid-template-columns: repeat(1, 1fr);
-  grid-row-gap: 10px;
-  grid-column-gap: 10px;
-
-  @include media-breakpoint-up(lg) {
-    grid-template-columns: repeat(3, 1fr);
-  }
-}

packages/grafana-ui/src/components/index.scss

@@ -3,7 +3,6 @@
 @import 'CustomScrollbar/CustomScrollbar';
 @import 'CustomScrollbar/CustomScrollbar';
 @import 'Drawer/Drawer';
 @import 'Drawer/Drawer';
 @import 'FormField/FormField';
 @import 'FormField/FormField';
-@import 'PanelOptionsGrid/PanelOptionsGrid';
 @import 'RefreshPicker/RefreshPicker';
 @import 'RefreshPicker/RefreshPicker';
 @import 'Forms/Legacy/Select/Select';
 @import 'Forms/Legacy/Select/Select';
 @import 'TableInputCSV/TableInputCSV';
 @import 'TableInputCSV/TableInputCSV';

packages/grafana-ui/src/components/index.ts

@@ -16,7 +16,6 @@ export { ButtonCascader } from './ButtonCascader/ButtonCascader';
 export { LoadingPlaceholder, LoadingPlaceholderProps } from './LoadingPlaceholder/LoadingPlaceholder';
 export { LoadingPlaceholder, LoadingPlaceholderProps } from './LoadingPlaceholder/LoadingPlaceholder';
 export { ColorPicker, SeriesColorPicker } from './ColorPicker/ColorPicker';
 export { ColorPicker, SeriesColorPicker } from './ColorPicker/ColorPicker';
 export { SeriesColorPickerPopover, SeriesColorPickerPopoverWithTheme } from './ColorPicker/SeriesColorPickerPopover';
 export { SeriesColorPickerPopover, SeriesColorPickerPopoverWithTheme } from './ColorPicker/SeriesColorPickerPopover';
-export { PanelOptionsGrid } from './PanelOptionsGrid/PanelOptionsGrid';
 export { EmptySearchResult } from './EmptySearchResult/EmptySearchResult';
 export { EmptySearchResult } from './EmptySearchResult/EmptySearchResult';
 export { PieChart, PieChartType } from './PieChart/PieChart';
 export { PieChart, PieChartType } from './PieChart/PieChart';
 export { UnitPicker } from './UnitPicker/UnitPicker';
 export { UnitPicker } from './UnitPicker/UnitPicker';