Automate WooCommerce 6.1.2

* Add - Added "Student Added To the Group" trigger.
* Add - Added "Student Removed From the Group" trigger.
* Add - Added `group.id` & `group.title` variables.
* Add - Composite Products, Product Bundles compatibility with abandoned carts (updated versions of both Extensions required).
* Add - MailPoet Integration (Add and Remove Subscribers from lists).
* Add - Sensei LMS Integration.
* Dev - Unit testing for MailPoet Integration.
* Tweak - PHP 8.1 compatibility detected during unit test runs.

* Add - conversions stats endpoint, use it for Conversion Analytics.
* Dev - Fix issues in some Customer Order Rules tests.
* Fix - Fatal error in {{ cart.items }} caused by deleted products.
* Tweak - WC 7.5 compatibility.
* Tweak - WP 6.2 compatibility.

* Dev - Update phpunit to allow testing with PHP 8.0.
* Fix - prevent Order Created trigger to run on Subscription Orders.