WooCommerce Product Add-Ons 6.8.2

* Tweak - Introduced admin validation to ensure that add-on titles do not exceed 255 characters.
* Tweak - Introduced the 'woocommerce_addons_product_page_container_classes' filter to add additional classes to the container add-on elements on the product page.
* Tweak - Updated the description for the 'Use Global add-ons?' option.
* Fix - Fixed the display of negative add-on prices.
* Fix - Updated the image swatches template to display only the add-on name on hover when its price is 0.
* Fix - Fixed a pagination issue with global add-ons.

* New - Added onboarding.
* Tweak - Important: Re-designed Product Data > Add-ons and Products > Add-ons tabs.
* Tweak - Important: Updated the process of importing/exporting add-ons to require fewer clicks.
* Tweak - Important: Moved the 'Show incomplete subtotals' setting to WooCommerce > Settings > Products > Add-ons.
* Fix - Resolved an issue that made add-ons show up twice when paying for failed subscription orders.
* Tweak - Declared compatibility with the cart/checkout Blocks.

* Tweak - Used admin theme colors in admin.
* Tweak - Displayed WC Admin bar on Global Product add-ons pages.
* Fix - Resolved an issue that accidentally selected image swatches in mobile screens while scrolling.