feat(twig): support storybook twig extension in linting (#613)

The automatic twig linting throws a fatal error when the Storybook module is
present, as the static tests don't bootstrap Drupal to discover twig
extensions. Since bootstrapping Drupal is expensive, instead check and load the
twig extension manually.

Re https://github.com/Lullabot/appstate-drupal/pull/33#issuecomment-2231807673

Co-authored-by: Sally Young <git@justa.fish>
Co-authored-by: Andrew Berry <andrew.berry@lullabot.com>