chore: switch to eslint-plugin-drupal-contrib
requested to merge issue/ckeditor5_paste_filter-3458367:3458367-switch-eslint-config-drupal-to into 1.0.x
eslint-config-drupal has some pain points (mostly due to React support which we don't need) and no updates since Fall 2020.
Other notable changes:
- Bring over the .prettierrc.json from core
- Use ignores rather than only linting js/ckeditor5_plugins
Closes #3458367