feat(insights): add most related issues to backend (#87033)

We've had some requests to add this back after removing the performance
sidebar link, so let's add it back!
<img width="651" alt="image"
src="https://github.com/user-attachments/assets/e9216dea-b546-494b-a747-9dbd922b4711"
/>

Author: DominikB2014

static/app/views/insights/pages/backend/backendOverviewPage.tsx

@@ -176,6 +176,7 @@ function GenericBackendOverviewPage() {
   const doubleChartRowCharts = [
     PerformanceWidgetSetting.SLOW_HTTP_OPS,
     PerformanceWidgetSetting.SLOW_DB_OPS,
+    PerformanceWidgetSetting.MOST_RELATED_ISSUES,
   ];
   const tripleChartRowCharts = filterAllowedChartsMetrics(
     organization,