All Products for WooCommerce Subscriptions 6.0.4

* Fix - Deactivate plugin for WooCommerce versions prior to 8.2 to avoid fatal errors.

* Important - New: PHP 7.4+ is now required.
* Important - New: WooCommerce 8.2+ is now required.
* Important - New: WordPress 6.2+ is now required.
* Important - New: WooCommerce Subscriptions 6.1+ is now required.
* Important - Removed all previously deprecated code.
* Tweak - Improved matching plan and applying discounts when manually adding products to active Subscriptions.
* Fix - Improved code to prevent fatal error triggered sometimes when using wc_get_price_excluding_tax/wc_get_price_including_tax.

* Fix - Reverted: Match plan and apply discounts when manually adding products to active Subscriptions.