Replace removed attribute definition operations

The nine per-entity operations are removed: productAttributeDefinitions, mediaAttributeDefinitions, customerAttributeDefinitions, addProductAttributeDefinitions, updateProductAttributeDefinitions, mediaAttributeDefinitionAdd, mediaAttributeDefinitionUpdate, addCustomerAttributeDefinition, and updateCustomerAttributeDefinition. Requests using these operations fail schema validation. Their brief deprecation period ended on October 14.

Attribute definitions for products, customers, and images now use attributeDefinitions(entityType:), attributesAddDefinition, and attributesUpdateDefinition. The mutations take an entityType, change one definition per call, and return the definition directly. They do not return result, status, message, or processId. Existing permissions still apply.

Use showInList instead of showInProductList, and remove brand from definition selections. Omitted settings keep their current values. Definition names must be unique within a company and entity type, and addProductAttributes rejects duplicate definitions in one request.