Convert all tables to SearchKit displays
This extension has 4 tables, which were rendered the traditional way with Smarty:
- View all discount codes
- View usage for a discount code
- View usage for a contact (embedded on contact summary tab)
- View usage for codes assigned to organization (embedded on organization contact summary tab)
This converts them all to SK displays and deletes the old page classes & templates.
Note: This will require a core version bump to 5.57