Retrieves an incident event service

curl --request GET \
  --url https://api.rootly.com/v1/incident_event_services/{id} \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "id": "b4f45bce-e917-42e9-be27-5283fb5cceef",
    "type": "incident_event_services",
    "attributes": {
      "incident_event_id": "8ffbf1e3-1449-485c-8a49-59e65c3c8246",
      "service_id": "e4515841-cb75-404b-ba34-97cba9e55d98",
      "status": "partial_outage"
    }
  }
}