Deletes a user product share by ID. Pending invites and accepted shares can be deleted. Invoking this method will increase the number of shares that the user has available for the given product. If the sharing_id represents an accepted product sharing, the member used will immediately lose access to the product that was shared with them (unless they have separately granted access to the same product). The member user will also receive an email notifying them that they have been removed from the product. This email is configurable in admin console.