message: Make CDN privateEndpointStatus modeled as string
diff: "type": "string"
  },
  "privateEndpointStatus": {
  - "description": "The Approval status for the connection to the Private Link",
  + "description": "The approval status for the connection to the Private Link",
  "type": "string",
  "readOnly": true,
  "enum": [
  ],
  "x-ms-enum": {
  "name": "PrivateEndpointStatus",
  - "modelAsString": false
  + "modelAsString": true
  }
  }
  }
  