WooCommerce Help Scout 4.0.4

* Fix: PLUGINS-3098 - Helpscout Fixes

* Fix: PLUGINS-3065 - Helpscout Fixes.

* Fix: PLUGINS-3053 - HPOS: Incorrect Sidebar Endpoint for Guest Users.
* Fix: PLUGINS-3054 - Help Scout Integration: 'Customer Not Found' Error.

Fix: PLUGINS-2762 - HelpScout Custom Sidebar App not working in PHP 8.

* Update: PLUGINS-2560 - updates inc. initial activation message and sign up link.

* Update: PLUGINS-2429 - Update for WooCommerce Legacy API deprecation.
* Update: PLUGINS-2515 - Add HelpScout link on settings page.
* Fix: PLUGINS-2514 - Correct wording of Notes info on settings page.

* PLUGINS-1990 - Woo Review Issues.