List all assignment labels

{
  "labels": [
    {
      "label": "FAW-BOARD",
      "color": "#FF5733",
      "guid": "b9f94491-bf1b-4689-ab67-bdce63501651"
    },
    {
      "label": "Important",
      "color": "#FF8791",
      "guid": "d290f1ee-6c54-4b01-90e6-d701748f0869"
    }
  ]
}

{
  "code": "BadRequest",
  "message": "Bad request.",
  "status": "BAD_REQUEST"
}

{
  "code": "Unauthorized",
  "message": "Not authorized.",
  "status": "UNAUTHORIZED"
}

{
  "code": "NotFound",
  "message": "The requested resource could not be found. Either no object exists with the ID provided in the path, or the path is incorrect.",
  "status": "NOT_FOUND"
}