Data Landing Zone should support credentials for destination

[cmenguy]

Currently we only fetch credentials and container for the user space, but there's a separate container and credentials for destinations in DLZ. See https://experienceleague.adobe.com/docs/experience-platform/destinations/catalog/cloud-storage/data-landing-zone.html?lang=en#connect-your-data-landing-zone-container-to-azure-storage-explorer