Delete All ModelDeployment Versions

Delete all versions of a ModelDeployment. If the deployment is in any state other than DELETED, this will set its status to DELETING. The models controller will then: 1. Delete the infrastructure (e.g., K8s NimService) 2. Update the status to DELETED If the deployment is already in DELETED status, calling delete again will permanently remove it from the database. Returns: - 202 Accepted: Deployment marked for deletion (status set to DELETING) - 204 No Content: Deployment permanently removed from database (was already DELETED) - 404 Not Found: Deployment doesn't exist