Automate WooCommerce 6.0.21

* Dev - E2E tests for Dashboard page.
* Dev - Remove unit test marked as incomplete.
* Dev - Update WooCommerce Bookings payment gateway title.
* Fix - Fatal error when enabling Active Campaign integration without API key.
* Fix - Logic for automatic database updates.
* Fix - Shop order transients hook setting customer id to 0.
* Fix - Use helper function for checking supported subscription payment methods.

* Dev - Add E2E documentation reference in the Readme file.
* Dev - Add documentation about engines directive.
* Dev - Add node ^18.17 and npm ^9.5 as supported engines for dependabot.
* Dev - Fix Linter for JS.
* Dev - Implement wp-env for E2E tests.
* Dev - Setup E2E Test Github Action Workflow.
* Dev - Setup Playwright for E2E tests.
* Fix - Fatal error getting product permalink on emails.
* Fix - HPOS SET clause for WC 8.1.
* Fix - Hide Tool Items Submenu items in WP.COM shops.
* Fix - Merge - Anonymize tracking data.
* Fix - Restore trigger options when cancelling a trigger change.
* Tweak - Anonymize specific workflow values for usage tracking.
* Tweak - Remove unnecessary columns from workflows table.
* Tweak - WC 8.1.0 compatibility.

* Dev - Add Action for Hooks Documentation Generator.
* Dev - Fetch WooCommerce and WordPress versions for our tests.
* Dev - Override vulnerability packages: xmlhttprequest-ssl and ws.
* Fix - {{ order.items }} variable does not return the correct variation if attributes are set to "Any...".
* Tweak - Apply consistent admin theme colors to common UI components.
* Tweak - Auto update the database if the filter woocommerce_enable_auto_update_db returns true.