Adding publicDisplayName field on ShopPlan

The publicDisplayName field is being added to the ShopPlan object. This field provides the publicly displayable name of the shop's current plan when requesting shop properties.

The publicDisplayName field returns a standardized set of plan names, similar to those currently provided by the displayName field. This standardization aims to simplify and unify the plan names that are publicly exposed.

Additionally, the plan previously known as Shopify has been renamed to Grow, and this change is reflected in the publicDisplayName field.

Please note that the displayName field will be deprecated in the future. We recommend updating your applications to use the publicDisplayName field to ensure compatibility with future updates.