Fix RouteSubscriber for admin routes

[iperaltamrmilu]

Many routes as /admin/dblog or /admin/content aren't set as _admin_route in their yml and following option is not set:

    foreach ($collection->all() as $route_name => $route) {
      if (
        str_starts_with($route_name, 'system.')
        || str_starts_with($route_name, 'view.')
        || $route->getOption('_admin_route')
        || ($route->getPath() === '/')
      ) {
        $route->setDefault('_disable_alias_subpaths', TRUE);
      }
    }

The reason is _admin_route is set in AdminRouteSubscriber and previous functionality is executed before, reading only yml file.

Also, setDefault doesn't work properly in onRequest because following condition is not checked:

    if ($request->attributes->get('_disable_alias_subpaths')) {
      return;
    }