Fix storybook / chromatic tests flakyness and integration tests (#11687)

## Storybook flakyness

### Actor Display image flakyness

<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/875c0738-5e31-4aba-9231-4ba5f78d1355"
/>

**Fix:** stop using a random usage

### Task Groups broken

<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/c67e47a1-a027-43f1-9601-68d61a8052b4"
/>

**Fix:** add missing TabListComponentInstance

## Flaky dates

Add https://github.com/k35o/storybook-addon-mock-date

## Integration tests

Fix broken tests due to relation refactoring

packages/twenty-server/src/engine/api/graphql/workspace-schema.factory.ts

@@ -37,11 +37,6 @@ export class WorkspaceSchemaFactory {
       return new GraphQLSchema({});
     }
 
-    const cachedIsNewRelationEnabled =
-      await this.workspaceCacheStorageService.getIsNewRelationEnabled(
-        authContext.workspace.id,
-      );
-
     const isNewRelationEnabled = await this.featureFlagService.isFeatureEnabled(
       FeatureFlagKey.IsNewRelationEnabled,
       authContext.workspace.id,
@@ -79,35 +74,6 @@ export class WorkspaceSchemaFactory {
       );
     }
 
-    // TODO: remove this after the feature flag is droped
-    if (
-      (isNewRelationEnabled && cachedIsNewRelationEnabled === undefined) ||
-      (isNewRelationEnabled !== cachedIsNewRelationEnabled &&
-        cachedIsNewRelationEnabled !== undefined)
-    ) {
-      // eslint-disable-next-line no-console
-      console.log(
-        chalk.yellow('Recomputing due to new relation feature flag'),
-        {
-          isNewRelationEnabled,
-        },
-      );
-
-      await this.workspaceCacheStorageService.setIsNewRelationEnabled(
-        authContext.workspace.id,
-        isNewRelationEnabled,
-      );
-
-      await this.workspaceMetadataCacheService.recomputeMetadataCache({
-        workspaceId: authContext.workspace.id,
-      });
-
-      throw new GraphqlQueryRunnerException(
-        'Metadata cache recomputation required due to relation feature flag change',
-        GraphqlQueryRunnerExceptionCode.METADATA_CACHE_FEATURE_FLAG_RECOMPUTATION_REQUIRED,
-      );
-    }
-
     const objectMetadataMaps =
       await this.workspaceCacheStorageService.getObjectMetadataMaps(
         authContext.workspace.id,