A dataset is deleted. The payload retains its ID and name for reconciliation.
POST
{ "type": "dataset.deleted", "timestamp": "2019-08-24T14:15:22Z", "attemptedAt": "2019-08-24T14:15:22Z", "webhookEventId": "string", "webhookId": "string", "projectId": "string", "dataset": { "id": "string", "name": "string" } }