nixos/tests/ringboard: add some slight delays between keypresses

      with subtest("Ensure clipboard is monitored"):

        with gedit_running: # type: ignore[union-attr]

          machine.send_chars("Hello world!")

          machine.send_chars("Hello world!", delay=0.1)

          machine.sleep(1)

          machine.send_key("ctrl-a")

          machine.sleep(1)

          machine.send_key("ctrl-c")

          machine.wait_for_console_text("Small selection transfer complete")

        machine.wait_until_succeeds("su - '${user}' -c 'journalctl --user -u ringboard-listener.service --grep \'Small selection transfer complete\'''", timeout=60)

        machine.succeed("su - '${user}' -c 'ringboard search Hello | grep world!'")

    '';

}