[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-server/src/engine/workspace-manager/dev-seeder/core/constants/page-layout-widget-seeds.constant.ts

@@ -11,7 +11,6 @@ export const PAGE_LAYOUT_WIDGET_SEEDS = {
   CUSTOMER_COMPANIES_BY_SIZE: 'CUSTOMER_COMPANIES_BY_SIZE_WIDGET',
   CUSTOMER_ANNUAL_RECURRING_REVENUE: 'CUSTOMER_ANNUAL_RECURRING_REVENUE_WIDGET',
   CUSTOMER_REVENUE_DISTRIBUTION: 'CUSTOMER_REVENUE_DISTRIBUTION_WIDGET',
-  CUSTOMER_AVERAGE_ARR: 'CUSTOMER_AVERAGE_ARR_WIDGET',
   CUSTOMER_LINKEDIN_COUNT: 'CUSTOMER_LINKEDIN_COUNT_WIDGET',
   CUSTOMER_LINKEDIN_DISTRIBUTION: 'CUSTOMER_LINKEDIN_DISTRIBUTION_WIDGET',
 

packages/twenty-server/src/engine/workspace-manager/dev-seeder/core/utils/get-page-layout-widget-data-seeds-v2.util.ts

@@ -168,40 +168,6 @@ export const getPageLayoutWidgetDataSeedsV2 = (
         } satisfies SeederFlatPageLayoutWidget)
       : null,
 
-    // GAUGE chart: Average ARR (Customer Analytics)
-    isDefined(companyArrFieldId)
-      ? ({
-          id: generateSeedId(
-            workspaceId,
-            PAGE_LAYOUT_WIDGET_SEEDS.CUSTOMER_AVERAGE_ARR,
-          ),
-          pageLayoutTabId: generateSeedId(
-            workspaceId,
-            PAGE_LAYOUT_TAB_SEEDS.CUSTOMER_ANALYTICS,
-          ),
-          title: 'Average ARR',
-          type: WidgetType.GRAPH,
-          gridPosition: { row: 0, column: 7, rowSpan: 6, columnSpan: 5 },
-          position: {
-            layoutMode: PageLayoutTabLayoutMode.GRID,
-            row: 0,
-            column: 7,
-            rowSpan: 6,
-            columnSpan: 5,
-          },
-          configuration: {
-            configurationType: WidgetConfigurationType.GAUGE_CHART,
-            aggregateFieldMetadataId: companyArrFieldId,
-            aggregateOperation: AggregateOperations.AVG,
-            displayDataLabel: true,
-            timezone: 'UTC',
-            firstDayOfTheWeek: CalendarStartDay.MONDAY,
-          },
-          objectMetadataId: companyObject?.id ?? null,
-          overrides: null,
-        } satisfies SeederFlatPageLayoutWidget)
-      : null,
-
     // PIE chart: Companies by LinkedIn (Customer Overview)
     isDefined(companyIdFieldId) && isDefined(companyLinkedinLinkFieldId)
       ? ({