WooCommerce Pre-Orders 2.2.6

* Dev - Bump WordPress "tested up to" version 6.6.
* Dev - Exclude the Woo Comment Hook `@since` sniff.
* Dev - Fix QIT E2E tests and add support for a few new test types.

* Dev - Bump WooCommerce "tested up to" version 9.0.
* Dev - Bump WooCommerce minimum supported version to 8.8.
* Dev - Bump WordPress "tested up to" version 6.5.
* Dev - Bump WordPress minimum supported version to 6.4.
* Dev - Update NPM packages and node version to v20 to modernize developer experience.
* Fix - Removed potential for duplicate content in customer facing Pre-order completion email.

* Add - Support for the new Product Block Editor.
* Dev - Bump WooCommerce "tested up to" version 8.6.
* Dev - Bump WooCommerce minimum supported version to 8.4.
* Dev - Bump PHP minimum supported version to 7.4.