[DEPRECATED] List incident custom field selections

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

{
  "data": [
    {
      "id": "<string>",
      "type": "incident_custom_field_selections",
      "attributes": {
        "incident_id": "<string>",
        "custom_field_id": 123,
        "value": "<string>",
        "selected_option_ids": [
          123
        ]
      }
    }
  ],
  "links": {
    "self": "<string>",
    "first": "<string>",
    "prev": "<string>",
    "next": "<string>",
    "last": "<string>"
  }
}