Remove claro_preprocess_filter_guidelines

I have reviewed the MR and also checked it locally.
The class is already defined in filter-guidelines.html.twig

{%
  set classes = [
    'filter-guidelines__item',
    'filter-guidelines__item--' ~ format.id|clean_class,
  ]
%}

We can go with this MR.
Thank you.

lauriii → closed merge request !4364

That looks like a different class that is being added in filter-guidelines.html.twig 🤔 Either way, I confirmed that this is no longer used by anything and that the filter descriptions are toggled as expected.

Committed c91fe0f and pushed to 11.x. Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.