Improve drilling: use rendering in isolation

Problem/Motivation

Inspired from what Display Builder does in https://git.drupalcode.org/project/display_builder/-/blob/1.0.x/src/Plug...

  protected function useAttributesVariable(array $renderable): bool {
    $random = \uniqid();
    $renderable['#attributes'][$random] = $random;
    $html = $this->renderer->renderInIsolation($renderable);

    return \str_contains((string) $html, $random);
  }

It should be possible to test when drilling if attributes is used or not with this logic.

It should simplify:
- src/Render/Element.php::isRenderElementAcceptingAttributes
- src/Render/Element.php::isThemeHookAcceptingAttributes