Refactor/centralize payment methods resolution #4927
Description
Currently payment methods available for an order are resolved at 2 different places:
- https://github.com/coopcycle/coopcycle-web/blob/cfee984f6138e68c802d1d915015b118a245b225/src/Action/Order/PaymentMethods.php
- https://github.com/coopcycle/coopcycle-web/blob/cfee984f6138e68c802d1d915015b118a245b225/src/Form/Checkout/CheckoutPaymentType.php
It needs to be centralized to avoid duplication, for example in a PaymentMethodsResolver class.