Description

Fixes #39208.

Currently, the @wordpress/eslint-plugin is declaring the WordPress fork of prettier as direct dependency and therefore making the wrong assumption that every project using that package is going to use WP fork of prettier.

This PR removes the alias of Prettier as a direct dependency of the @wordpress/eslint-plugin package that should address this issue. To get us there prettier becomes an optional peer dependency. This enforces the consumer of the plugin to explicitly install prettier in their project to activate all custom rules related to code formatting. In that aspect, it might create some friction. However, in the case projects are using @wordpress/scripts everything should work as before.

Testing Instructions

Ensured that the following scripts work as before in Gutenberg:

npm run lint-js
npm run format-js

Types of changes

Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• [-] My code follows the accessibility standards.
• [-] I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• [-] I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).
• [-] I've updated related schemas if appropriate.