Removing deprecated PRIVATE and PUBLIC_READ enums on metaobject definitions

We are updating the MetaobjectAdminAccess enum by deprecating the PRIVATE and PUBLIC_READ values. These values are now obsolete and are never returned by the API.

This change removes ambiguity, as the deprecated access values do not accurately reflect the actual access behaviors. There are no required changes, but updating your code will help maintain clarity and prevent potential access issues.