Fetches a single page of results for a given job (previously triggered by the start endpoint).

You will normally call this endpoint by simply iterating over the nextPageUrl field in the response from the start endpoint.

If you get a 425, retry on an interval until you get the results back. When you get a result, the response will include a nextPageUrl that you can use to fetch the next page.

Note: If no nextPageUrl is returned, you have reached the end of the job.