Enabled RLS seed dev (#16884)

And remove IS_GLOBAL_WORKSPACE_DATASOURCE_ENABLED

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Removes deprecated feature flag and enables RLS predicates in dev**
> 
> - Deletes `IS_GLOBAL_WORKSPACE_DATASOURCE_ENABLED` from server enum
and frontend generated GraphQL types
> - Updates dev seeder to enable
`IS_ROW_LEVEL_PERMISSION_PREDICATES_ENABLED` instead of the removed flag
> - Adjusts tests and mocked `GlobalWorkspaceDataSource` defaults to
drop the removed flag
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
7f4d5a401a42e46dfcc576161d4f8167544f4453. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-server/src/engine/twenty-orm/entity-manager/workspace-entity-manager.spec.ts

@@ -249,7 +249,6 @@ describe('WorkspaceEntityManager', () => {
         IS_EMAILING_DOMAIN_ENABLED: false,
         IS_WORKFLOW_RUN_STOPPAGE_ENABLED: false,
         IS_DASHBOARD_V2_ENABLED: false,
-        IS_GLOBAL_WORKSPACE_DATASOURCE_ENABLED: false,
         IS_ROW_LEVEL_PERMISSION_PREDICATES_ENABLED: false,
       },
       permissionsPerRoleId: {},