Changes to Retrieve billing usage

removed the optional property data/attributes/products/items/metadata/hostname from the response with the 200 status

removed the optional property data/attributes/products/items/metadata/id from the response with the 200 status

removed the optional property data/attributes/products/items/metadata/plan from the response with the 200 status

removed the optional property data/attributes/products/items/metadata/tags from the response with the 200 status

added the new GB enum value to the data/attributes/products/items/unit response property for the response status 200

added the optional property data/attributes/amount to the response with the 200 status

added the optional property data/attributes/products/items/amount to the response with the 200 status

added the optional property data/attributes/products/items/metadata/billing_unit_divisor to the response with the 200 status

added the optional property data/attributes/products/items/metadata/bucket to the response with the 200 status

added the optional property data/attributes/products/items/metadata/servers to the response with the 200 status

added the optional property data/attributes/products/items/unit_amount to the response with the 200 status

added the optional property data/type to the response with the 200 status

added the optional property meta to the response with the 200 status