[Dashboards] [Warning] Remove gauge chart support and delete existing widgets (#20172)

## Summary

Removes gauge chart from the chart-type picker and deletes existing
gauge widgets via a workspace migration. The gauge was rendering a
hardcoded `0.7 / "Progress"` stub regardless of configuration -- never
wired to real data.

The contract stays in place. We keep
`WidgetConfigurationType.GAUGE_CHART`, the DTO, the GraphQL union
member, and the gauge folder -- so stored gauge JSON still resolves
through the schema. The render path falls through to `default: return
null`, so any un-migrated gauge widget renders as an empty cell, not a
crash.

This PR just removes existing gauge widgets if there are any (via
`upgrade:2-3:delete-gauge-widgets`). The deliberate cleanup -- deleting
the type definitions, the gauge folder, the DTO -- comes in a follow-up
PR after the migration has run.

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/modules/page-layout/widgets/graph/components/GraphWidget.tsx

@@ -1,20 +1,11 @@
-import { WidgetSkeletonLoader } from '@/page-layout/widgets/components/WidgetSkeletonLoader';
+import { PageLayoutWidgetInvalidConfigDisplay } from '@/page-layout/widgets/components/PageLayoutWidgetInvalidConfigDisplay';
 import { GraphWidgetAggregateChartRenderer } from '@/page-layout/widgets/graph/graph-widget-aggregate-chart/components/GraphWidgetAggregateChartRenderer';
 import { GraphWidgetBarChartRenderer } from '@/page-layout/widgets/graph/graph-widget-bar-chart/components/GraphWidgetBarChartRenderer';
 import { GraphWidgetLineChartRenderer } from '@/page-layout/widgets/graph/graph-widget-line-chart/components/GraphWidgetLineChartRenderer';
 import { GraphWidgetPieChartRenderer } from '@/page-layout/widgets/graph/graph-widget-pie-chart/components/GraphWidgetPieChartRenderer';
 import { useCurrentWidget } from '@/page-layout/widgets/hooks/useCurrentWidget';
-import { lazy, Suspense } from 'react';
 import { WidgetConfigurationType } from '~/generated-metadata/graphql';
 
-const GraphWidgetGaugeChart = lazy(() =>
-  import(
-    '@/page-layout/widgets/graph/graph-widget-gauge-chart/components/GraphWidgetGaugeChart'
-  ).then((module) => ({
-    default: module.GraphWidgetGaugeChart,
-  })),
-);
-
 export const GraphWidget = () => {
   const widget = useCurrentWidget();
 
@@ -24,31 +15,6 @@ export const GraphWidget = () => {
     case WidgetConfigurationType.AGGREGATE_CHART:
       return <GraphWidgetAggregateChartRenderer />;
 
-    case WidgetConfigurationType.GAUGE_CHART: {
-      const gaugeData = {
-        value: 0.7,
-        min: 0,
-        max: 1,
-        label: 'Progress',
-      };
-
-      return (
-        <Suspense fallback={<WidgetSkeletonLoader />}>
-          <GraphWidgetGaugeChart
-            data={{
-              value: gaugeData.value,
-              min: gaugeData.min,
-              max: gaugeData.max,
-              label: gaugeData.label,
-            }}
-            displayType="percentage"
-            showValue
-            id={`gauge-chart-${widget.id}`}
-          />
-        </Suspense>
-      );
-    }
-
     case WidgetConfigurationType.PIE_CHART:
       return <GraphWidgetPieChartRenderer />;
 
@@ -58,6 +24,9 @@ export const GraphWidget = () => {
     case WidgetConfigurationType.LINE_CHART:
       return <GraphWidgetLineChartRenderer />;
 
+    case WidgetConfigurationType.GAUGE_CHART:
+      return <PageLayoutWidgetInvalidConfigDisplay />;
+
     default:
       return null;
   }

packages/twenty-front/src/modules/side-panel/pages/page-layout/components/ChartTypeSelectionSection.tsx

@@ -12,7 +12,6 @@ const graphTypeOptions = [
   GraphType.LINE,
   GraphType.PIE,
   GraphType.AGGREGATE,
-  GraphType.GAUGE,
 ];
 
 const StyledChartTypeSelectionContainer = styled.div`