Added Replicate Cart in Business Unit endpoint

You can now replicate Carts in a given Business Unit using the Associate Carts endpoint.

• [API] Added Replicate Cart in Business Unit endpoint.
• [GraphQL API] Changed the Mutation type:
  • Argument asAssociate was added to Mutation.replicateCart field

The following changes were introduced in terms of GraphQL SDL:

extend type Mutation {
  replicateCart(key: String, reference: ReferenceInput!, storeKey: KeyReferenceInput
, asAssociate: AsAssociateArgument): Cart
}