[SOL/1744] Added code character limit (8,16) and appropriate message on Coupon Code field
[SOL/1744] Added code character limit (8,16) and appropriate message on Coupon Code field

eduNEXT/edunext-ecommerce,eduNEXT/edunext-ecommerce,edx/ecommerce,edx/ecommerce,edx/ecommerce,eduNEXT/edunext-ecommerce,mferenca/HMS-ecommerce,mferenca/HMS-ecommerce,edx/ecommerce,eduNEXT/edunext-ecommerce,mferenca/HMS-ecommerce