[7.x] [Discover] Improve styling of graphs in sidebar (#69440)

[andreadelrio]

Backports the following commits to 7.x:

• [Discover] Improve styling of graphs in sidebar ([Discover] Improve styling of graphs in sidebar #69440)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 4667093

Build metrics

@kbn/optimizer bundle module count

id	value	diff	baseline
discover	80	+5	75

page load asset size

beta

id	value	diff	baseline
/bundles/app/core/bootstrap.js	-	-13.8KB	13.8KB
/bundles/core/core.entry.js	-	-1.1MB	1.1MB
/bundles/kbn-ui-shared-deps/kbn-ui-shared-deps.@elastic.js	-	-4.0MB	4.0MB
/bundles/kbn-ui-shared-deps/kbn-ui-shared-deps.css	-	-183.7KB	183.7KB
/bundles/kbn-ui-shared-deps/kbn-ui-shared-deps.js	-	-4.6MB	4.6MB
/bundles/kbn-ui-shared-deps/kbn-ui-shared-deps.v7.light.css	-	-511.3KB	511.3KB
/bundles/light_theme.style.css	-	-95.9KB	95.9KB
/bundles/plugin/advancedSettings/advancedSettings.plugin.js	-	-941.3KB	941.3KB
/bundles/plugin/alerts/alerts.plugin.js	-	-89.5KB	89.5KB
/bundles/plugin/apm/apm.plugin.js	-	-219.2KB	219.2KB
/bundles/plugin/apmOss/apmOss.plugin.js	-	-4.2KB	4.2KB
/bundles/plugin/beats_management/beats_management.plugin.js	-	-522.9KB	522.9KB
/bundles/plugin/bfetch/bfetch.plugin.js	-	-28.7KB	28.7KB
/bundles/plugin/canvas/canvas.plugin.js	-	-2.0MB	2.0MB
/bundles/plugin/charts/charts.plugin.js	-	-833.9KB	833.9KB
/bundles/plugin/cloud/cloud.plugin.js	-	-6.3KB	6.3KB
/bundles/plugin/console/console.plugin.js	-	-28.0KB	28.0KB
/bundles/plugin/crossClusterReplication/crossClusterReplication.plugin.js	-	-152.3KB	152.3KB
/bundles/plugin/dashboard/dashboard.plugin.js	-	-634.2KB	634.2KB
/bundles/plugin/dashboardEnhanced/dashboardEnhanced.plugin.js	-	-143.5KB	143.5KB
/bundles/plugin/dashboardMode/dashboardMode.plugin.js	-	-109.3KB	109.3KB
/bundles/plugin/data/data.plugin.js	-	-1.4MB	1.4MB
/bundles/plugin/dataEnhanced/dataEnhanced.plugin.js	-	-138.1KB	138.1KB
/bundles/plugin/devTools/devTools.plugin.js	-	-123.9KB	123.9KB
/bundles/plugin/discover/discover.plugin.js	-	-221.5KB	221.5KB
/bundles/plugin/discoverEnhanced/discoverEnhanced.plugin.js	-	-28.1KB	28.1KB
/bundles/plugin/embeddable/embeddable.plugin.js	-	-318.8KB	318.8KB
/bundles/plugin/embeddableEnhanced/embeddableEnhanced.plugin.js	-	-26.3KB	26.3KB
/bundles/plugin/esUiShared/esUiShared.plugin.js	-	-927.8KB	927.8KB
/bundles/plugin/expressions/expressions.plugin.js	-	-314.8KB	314.8KB
/bundles/plugin/features/features.plugin.js	-	-13.4KB	13.4KB
/bundles/plugin/fileUpload/fileUpload.plugin.js	-	-688.0KB	688.0KB
/bundles/plugin/globalSearch/globalSearch.plugin.js	-	-29.0KB	29.0KB
/bundles/plugin/graph/graph.plugin.js	-	-15.3KB	15.3KB
/bundles/plugin/grokdebugger/grokdebugger.plugin.js	-	-11.2KB	11.2KB
/bundles/plugin/home/home.plugin.js	-	-24.6KB	24.6KB
/bundles/plugin/indexLifecycleManagement/indexLifecycleManagement.plugin.js	-	-184.2KB	184.2KB
/bundles/plugin/indexManagement/indexManagement.plugin.js	-	-684.1KB	684.1KB
/bundles/plugin/indexPatternManagement/indexPatternManagement.plugin.js	-	-137.3KB	137.3KB
/bundles/plugin/infra/infra.plugin.js	-	-92.9KB	92.9KB
/bundles/plugin/ingestPipelines/ingestPipelines.plugin.js	-	-30.8KB	30.8KB
/bundles/plugin/inputControlVis/inputControlVis.plugin.js	-	-258.9KB	258.9KB
/bundles/plugin/inspector/inspector.plugin.js	-	-238.3KB	238.3KB
/bundles/plugin/kibanaLegacy/kibanaLegacy.plugin.js	-	-174.7KB	174.7KB
/bundles/plugin/kibanaReact/kibanaReact.plugin.js	-	-575.3KB	575.3KB
/bundles/plugin/kibanaUtils/kibanaUtils.plugin.js	-	-434.4KB	434.4KB
/bundles/plugin/lens/lens.plugin.js	-	-750.0KB	750.0KB
/bundles/plugin/licenseManagement/licenseManagement.plugin.js	-	-25.8KB	25.8KB
/bundles/plugin/licensing/licensing.plugin.js	-	-21.6KB	21.6KB
/bundles/plugin/logstash/logstash.plugin.js	-	-141.8KB	141.8KB
/bundles/plugin/management/management.plugin.js	-	-25.9KB	25.9KB
/bundles/plugin/maps/maps.plugin.js	-	-220.6KB	220.6KB
/bundles/plugin/mapsLegacy/mapsLegacy.plugin.js	-	-1.0MB	1.0MB
/bundles/plugin/mapsLegacyLicensing/mapsLegacyLicensing.plugin.js	-	-3.9KB	3.9KB
/bundles/plugin/ml/ml.plugin.js	-	-1.3MB	1.3MB
/bundles/plugin/monitoring/monitoring.plugin.js	-	-22.8KB	22.8KB
/bundles/plugin/navigation/navigation.plugin.js	-	-122.2KB	122.2KB
/bundles/plugin/newsfeed/newsfeed.plugin.js	-	-22.7KB	22.7KB
/bundles/plugin/observability/observability.plugin.js	-	-103.1KB	103.1KB
/bundles/plugin/painlessLab/painlessLab.plugin.js	-	-158.8KB	158.8KB
/bundles/plugin/regionMap/regionMap.plugin.js	-	-791.7KB	791.7KB
/bundles/plugin/remoteClusters/remoteClusters.plugin.js	-	-35.2KB	35.2KB
/bundles/plugin/reporting/reporting.plugin.js	-	-257.7KB	257.7KB
/bundles/plugin/rollup/rollup.plugin.js	-	-186.0KB	186.0KB
/bundles/plugin/savedObjects/savedObjects.plugin.js	-	-196.2KB	196.2KB
/bundles/plugin/savedObjectsManagement/savedObjectsManagement.plugin.js	-	-176.6KB	176.6KB
/bundles/plugin/searchprofiler/searchprofiler.plugin.js	-	-42.8KB	42.8KB
/bundles/plugin/security/security.plugin.js	-	-248.0KB	248.0KB
/bundles/plugin/share/share.plugin.js	-	-80.5KB	80.5KB
/bundles/plugin/snapshotRestore/snapshotRestore.plugin.js	-	-57.5KB	57.5KB
/bundles/plugin/spaces/spaces.plugin.js	-	-367.3KB	367.3KB
/bundles/plugin/statusPage/statusPage.plugin.js	-	-3.6KB	3.6KB
/bundles/plugin/telemetry/telemetry.plugin.js	-	-77.2KB	77.2KB
/bundles/plugin/telemetryManagementSection/telemetryManagementSection.plugin.js	-	-27.5KB	27.5KB
/bundles/plugin/tileMap/tileMap.plugin.js	-	-807.1KB	807.1KB
/bundles/plugin/transform/transform.plugin.js	-	-21.6KB	21.6KB
/bundles/plugin/triggers_actions_ui/triggers_actions_ui.plugin.js	-	-103.0KB	103.0KB
/bundles/plugin/uiActions/uiActions.plugin.js	-	-159.8KB	159.8KB
/bundles/plugin/uiActionsEnhanced/uiActionsEnhanced.plugin.js	-	-124.1KB	124.1KB
/bundles/plugin/upgradeAssistant/upgradeAssistant.plugin.js	-	-46.6KB	46.6KB
/bundles/plugin/uptime/uptime.plugin.js	-	-327.2KB	327.2KB
/bundles/plugin/usageCollection/usageCollection.plugin.js	-	-24.4KB	24.4KB
/bundles/plugin/visTypeMarkdown/visTypeMarkdown.plugin.js	-	-512.5KB	512.5KB
/bundles/plugin/visTypeMetric/visTypeMetric.plugin.js	-	-536.7KB	536.7KB
/bundles/plugin/visTypeTable/visTypeTable.plugin.js	-	-563.0KB	563.0KB
/bundles/plugin/visTypeTagcloud/visTypeTagcloud.plugin.js	-	-797.1KB	797.1KB
/bundles/plugin/visTypeTimelion/visTypeTimelion.plugin.js	-	-670.7KB	670.7KB
/bundles/plugin/visTypeTimeseries/visTypeTimeseries.plugin.js	-	-212.2KB	212.2KB
/bundles/plugin/visTypeVega/visTypeVega.plugin.js	-	-580.3KB	580.3KB
/bundles/plugin/visTypeVislib/visTypeVislib.plugin.js	-	-1.2MB	1.2MB
/bundles/plugin/visualizations/visualizations.plugin.js	-	-343.4KB	343.4KB
/bundles/plugin/visualize/visualize.plugin.js	-	-18.2KB	18.2KB
/bundles/plugin/watcher/watcher.plugin.js	-	-35.2KB	35.2KB
/node_modules/@kbn/ui-framework/dist/kui_light.css	-	-62.1KB	62.1KB
/translations/en.json	-	-29.0B	29.0B
/ui/fonts/inter_ui/Inter-UI-Medium.woff2	-	-92.2KB	92.2KB
/ui/fonts/inter_ui/Inter-UI-Regular.woff2	-	-86.4KB	86.4KB
total	-	-36.6MB	-

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream