Delete an event type (fails if it has active subscriptions)

{
  "error": {
    "code": "unauthorized",
    "message": "Missing or invalid authorization header"
  }
}

{
  "error": {
    "code": "token_disabled",
    "message": "Management token is disabled"
  }
}

{
  "error": {
    "code": "not_found",
    "message": "Event type not found"
  }
}

{
  "error": {
    "code": "conflict",
    "message": "Cannot delete event type with 3 active subscription(s). Remove subscriptions first."
  }
}