Patterns: Reveal the Featured pattern category, and make it the first in the list

[andrewserong]

Changes proposed in this Pull Request

• Reveal the Featured pattern category in the pattern inserter
• Unregister existing pattern categories, and re-register them along with the pattern categories we're registering in the ETK plugin, so that they're all sorted alphabetically
• Once sorted alphabetically by slug, move the Featured category to be the first in the list

Screenshot

Testing instructions

• Apply this change in your sandbox, and test the pattern inserter. Are the pattern categories working correctly and sorted correctly?
• What about if we have the Twenty Twenty One theme applied (or any theme with its own patterns), does the sorting hold up (I haven't tested this yet)
• What about in another language, is the sorting correct? (We might need to adjust to sort by the label instead of the slug 🤔

Related to 120-gh-Automattic/view-design
CC: @joanrho

[matticbot]

Test live: https://calypso.live/?branch=update/switch-on-featured-category-for-patterns

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

Caution: This PR affects files in the Editing Toolkit Plugin on WordPress.com
Please ensure your changes work on WordPress.com before merging.

D56791-code has been created so you can easily test it on your sandbox. See this FieldGuide page about developing the Editing Toolkit Plugin for more info: PCYsg-ly5-p2

[glendaviesnz]

This tested as advertised for me with english, but the sorting is out in Spanish:

[andrewserong]

Thanks for testing @glendaviesnz! I've updated it to sort by the label instead of the slug, and to be case insensitive just in case there are strings with the wrong case (like we have for contacto in Spanish, which should probably be Contacto?). Fixing the translation is a separate issue, but at least we can make sure it's in the correct order in this PR 🙂

[glendaviesnz]

Works for me - over to you if you want to explore the union operator option mentioned