[permissions] Enable permissionsV2 in seeds (#12623)

In this PR

- enable permissions V2 in seeds 
- remove permission V2 toggle in tests

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

@@ -45,6 +45,11 @@ export const seedFeatureFlags = async (
         workspaceId: workspaceId,
         value: true,
       },
+      {
+        key: FeatureFlagKey.IS_PERMISSIONS_V2_ENABLED,
+        workspaceId: workspaceId,
+        value: true,
+      },
     ])
     .execute();
 };