Skip learn gitlab unauthenticated spec

What does this MR do and why?

skip failed pipeline job https://jihulab.com/gitlab-cn/gitlab/-/jobs/10769932

related upstream MR https://gitlab.com/gitlab-org/gitlab/-/merge_requests/132453

upstream mr add saas label to spec will auto enable Gitlab.com? to true in spec

jh override route_not_found method to 401 make the spec failed

jh/app/controllers/jh/application_controller.rb:

    override :route_not_found
    def route_not_found
      return super unless ::Gitlab.com?
      return super if Gitlab.hk?

      if current_user || browser.bot.search_engine?
        not_found
      else
        store_location_for(:user, request.fullpath) unless request.xhr?

        unauthorized!
      end
    end

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