chore: remove IS_DASHBOARD_V2_ENABLED feature flag (#19079)

## Summary
- Remove the `IS_DASHBOARD_V2_ENABLED` feature flag from the codebase
- Dashboard V2 features (gauge charts, line charts, pie charts) are now
always enabled
- Remove the validator gate that blocked gauge chart creation/update
without the flag
- Clean up all related code: seed data, dev-seeder service, widget
seeds, and test mocks

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

@@ -29,7 +29,6 @@ const getFieldId = (
 export const getPageLayoutWidgetDataSeeds = (
   workspaceId: string,
   objectMetadataItems: ObjectMetadataEntity[],
-  isDashboardV2Enabled: boolean,
 ): SeederFlatPageLayoutWidget[] => {
   const opportunityObject = objectMetadataItems.find(
     (obj) =>
@@ -524,9 +523,10 @@ export const getPageLayoutWidgetDataSeeds = (
     } satisfies SeederFlatPageLayoutWidget,
   ].filter(isDefined);
 
-  const v2Widgets = isDashboardV2Enabled
-    ? getPageLayoutWidgetDataSeedsV2(workspaceId, objectMetadataItems)
-    : [];
+  const v2Widgets = getPageLayoutWidgetDataSeedsV2(
+    workspaceId,
+    objectMetadataItems,
+  );
 
   return [...v1Widgets, ...v2Widgets];
 };

packages/twenty-server/src/engine/workspace-manager/dev-seeder/core/utils/seed-feature-flags.util.ts

@@ -45,11 +45,6 @@ export const seedFeatureFlags = async ({
         workspaceId: workspaceId,
         value: true,
       },
-      {
-        key: FeatureFlagKey.IS_DASHBOARD_V2_ENABLED,
-        workspaceId: workspaceId,
-        value: true,
-      },
       {
         key: FeatureFlagKey.IS_ROW_LEVEL_PERMISSION_PREDICATES_ENABLED,
         workspaceId: workspaceId,

packages/twenty-server/src/engine/workspace-manager/dev-seeder/core/utils/seed-page-layout-widgets.util.ts

@@ -11,20 +11,17 @@ export const seedPageLayoutWidgets = async ({
   schemaName,
   workspaceId,
   objectMetadataItems,
-  isDashboardV2Enabled,
   workspaceCustomApplicationId,
 }: {
   dataSource: DataSource;
   schemaName: string;
   workspaceId: string;
   objectMetadataItems: ObjectMetadataEntity[];
-  isDashboardV2Enabled: boolean;
   workspaceCustomApplicationId: string;
 }) => {
   const widgetSeeds = getPageLayoutWidgetDataSeeds(
     workspaceId,
     objectMetadataItems,
-    isDashboardV2Enabled,
   );
 
   const pageLayoutWidgets = widgetSeeds.map((widget) => {

packages/twenty-server/src/engine/workspace-manager/dev-seeder/services/dev-seeder.service.ts

@@ -2,7 +2,6 @@ import { Injectable, Logger } from '@nestjs/common';
 import { InjectDataSource } from '@nestjs/typeorm';
 
 import { ALL_METADATA_NAME } from 'twenty-shared/metadata';
-import { FeatureFlagKey } from 'twenty-shared/types';
 import { DataSource } from 'typeorm';
 
 import { ApplicationRegistrationService } from 'src/engine/core-modules/application/application-registration/application-registration.service';
@@ -146,15 +145,11 @@ export class DevSeederService {
       relations: { fields: true },
     });
 
-    const isDashboardV2Enabled =
-      featureFlagsMap[FeatureFlagKey.IS_DASHBOARD_V2_ENABLED] ?? false;
-
     await seedPageLayoutWidgets({
       dataSource: this.coreDataSource,
       schemaName: 'core',
       workspaceId,
       objectMetadataItems,
-      isDashboardV2Enabled,
       workspaceCustomApplicationId: workspaceCustomFlatApplication.id,
     });