[permissions] Prepare for roll-out (#10676)

Closes https://github.com/twentyhq/core-team-issues/issues/469 and
https://github.com/twentyhq/core-team-issues/issues/500

In this PR
1. stop conditioning permission initialization for a workspace to env
variable value. Instead we want to create and assign permissions and
roles in all new workspaces. For now that will be totally silent.
2. temporarily, the default role is set to the admin role for new
workspaces. it will also be the case for existing workspaces through the
backfill command. Member role is still being created though. (when we
will do the final roll-out we will update this so that future workspaces
have the member role as default role. our goal here is not to break any
current behaviour for users, that today have all have the equivalent of
admin rights).

packages/twenty-server/src/engine/metadata-modules/permissions/permissions.service.ts

@@ -145,10 +145,6 @@ export class PermissionsService {
     return roleOfUserWorkspace?.[roleColumn] === true;
   }
 
-  public async isPermissionsEnabled(): Promise<boolean> {
-    return this.environmentService.get('PERMISSIONS_ENABLED') === true;
-  }
-
   private getRoleColumnForRequiredPermission(
     requiredPermission: PermissionsOnAllObjectRecords,
   ): keyof RoleEntity {