WooCommerce Subscriptions 6.9.0

* Add: Include trial_period, suspension_count, and requires_manual_renewal in the REST API response for subscriptions.
* Update: When a renewal order's payment is skipped, include the order's current status in the note to help troubleshooting.
* Fix: Label improvements on subscription and order page templates.
* Fix: Fixed an issue with subscriptions containing multiple renewal orders to mark a random item as processing, instead of the last order.
* Fix: Prevent errors from invalid subscription objects during customer payment method updates.
* Dev: Updated subscriptions-core to 7.3.0.

* Fix: Resolved errors preventing subscription-related webhooks from sending on WC 9.0 stores.

* Add: New WP CLI support to manage subscriptions via command line.
* Add: Introduce wc/v2 subscription REST API endpoints.
* Fix: label improvement on my subscription page template.
* Fix: Regenerate subscriptions related order caches (renewal, resubscribe, switch) if it's stored as an invalid value to prevent fatal errors.
* Update: Show "FREE" instead of 0 when there is no shipping cost in the recurring totals section of the Cart and Checkout blocks (requires WooCommerce 9.0+).
* Dev: New function wcs_set_recurring_item_total() to set line item totals that have been copied from an initial order to their proper recurring totals (i.e. remove sign-up fees).
* Dev: Updated subscriptions-core to 7.2.0.