* Update all references to of Loader::is_feature_enabled to use Feature class
* Check if feature is enabled instead of existence in deprecated feature method
* Add changelog entry
* Update dependencies in prep for Composer 2.x.
* Rollback jetpack autoloader update.
* Restore range versions for composer dependencies, regenerate lock with Composer 1.x.
* Fix PSR-4 Classes (https://github.com/woocommerce/woocommerce-admin/pull/5473)
* PSR-4 class names need to match their filename.
Remove underscores in classnames.
* Fix reported class name in deprecation notice.
* Fix comments.
* We don't need composer dependencies in core WC test setup.
* Update composer lockfile using version 2.x.
* Temporarily turn off error display.
Function deprecation notices are breaking tests.
* Change WooCommerce Card to WordPress Card in the WelcomeCard component.
Use isElevated and margin-bottom to make the Card look close to previous UI.
* Use WordPress Card in KnowledgeBase.
For the description in Card header, it will be rendered as a p element instead of h2, which should be more semantically correct. Test is updated to reflect this.
* Add Card component wrapper that supports title and description props.
* Use WordPress Card component wrapper in recommended extensions.
* Code refactor to use WordPress Card wrapper.
* Use WordPress Card wrapper in installed extension.
* Use margin-bottom for children layout at the parent CSS level.
* Add test for Card.
* Fix no margin between cards in Coupons page, and remove previous css for WooCommerce Card.
* Remove old WooCommerce Card css.
* Don't use isElevated in Card, to match the style in WooCommerce Home screen.
* Make item border color consistent with WordPress Card in Installed Extension card.
Use WordPress Card without CardBody here because we don't want the padding from CardBody.
* Make the card description look similar to previous WooCommerce Card description.
* Fix spelling in CSS class names.
* Fix WooCommerce spelling in comment.
* Change the Marketing Card style to match with WooCommerce Home style.
Also change the text gray color to use CSS variable instead of hardcoded gray value.
Also remove the usage of h2 in the Card header to follow WooCommerce Home style.
* Use $gray-200 as light borders between items in card.
* Remove unneeded CSS code based on TODO in comment.
* Preventing the legacy coupons page from being readded when the navigation plugin is active (woocommerce/navigation woocommerce/woocommerce-admin#122)
I've also added a check to prevent the "coupons page has moved" note from being displayed, since it's no longer applicable in the new nav.
* Addressing linting issues with PHP files
* Updating conditions to work correctly with navigation as feature instead of external plugin
* Updating comment text
* Rename admin notes classes and file names to fit conventions
* Use a facade class that adds deprecation warnings to each function call
* Tidy up after rebase
Co-authored-by: Rebecca Scott <me@becdetat.com>