Resolve #3500987 "Case study content type"

Closes #3500987 and #3515910

Bluecheese MR: !166 (merged)

Drupalorg MR: https://gitlab.com/drupal-infrastructure/sites/drupalorg/-/merge_requests/136

Drupalorg Module PR: drupalorg!333 (merged)

Steps to test:

1. Checkout the drupalorg MR and the Bluecheese MR linked above.
2. Run ddev composer install
3. Run ddev composer recreate
4. Try creating a case study page and confirm that fields work as expected and that the layout matches the Figma at desktop and mobile.

To test the views page:

1. Create a landing page and give it a path of /case-studies and use a "Hero Cover Image" component with a background of "Navy to Drupal Blue Gradient" and check "Make text lighter for darker background" and add the Hero title and description to match the Case Study landing Page.
2. Under components add "block reference section" and select "case studies: Landing page section" and uncheck display title
3. test the filters at desktop and mobile.
4. Test the the pager renders as expected. Bonus: mini pager should look pretty good too.

To fully test you should create 15 + case study pages, probably 100+ to test views pager. You can do this with Devel Generate. You will need to generate media images and organization nodes before generating the case studies.