API v1.2.15

Added the ability to define dynamic pricing of variants for order lines and checkout lines. Overrides can be accomplished with the following mutations:
- checkoutLinePriceOverride
- draftOrderLinePriceOverride
- nauticalDraftOrderLinePriceOverride
Added the checkoutDelete mutation for those with Manage Marketplace permission to be able to remove all checkoutLines, and remove an un-captured and unprocessed payment associated with the checkout
Added logic to limit the number of active app integrations of the same category or subcategory to prevent issues with conflicting integrations

Fixed an issue where filtering the products query by features could return duplicate features
Fixed logic related to filtering by the buyer role
Fixed filtering the plugin list by isFeature
Fixed an issue where partial payments were being shown as fully paid in Nautical
Fixed an issue where shipping was being calculated twice at checkout in certain environments, which caused transactions to fail
Fixed an issue where order payout_status was not being updated to "Not Ready" after the fulfillment was canceled
Fixed an issue with the insights_top_performing_products query which could cause incorrect reporting