curl --request GET \
  --url http://localhost:3001/api/admin/user-properties/ \
  --header 'Authorization: <api-key>'

{
  "userProperties": [
    {
      "id": "<string>",
      "workspaceId": "<string>",
      "name": "<string>",
      "definition": {},
      "updatedAt": 123,
      "createdAt": 123,
      "definitionUpdatedAt": 123,
      "exampleValue": "<string>",
      "lastRecomputed": 123
    }
  ]
}