Returns the catalog of datasets available for querying via the Datasets API. Each entry includes a machine-readable name (used as the datasetName path parameter in "Get Fields from Dataset (v1.2)" and "Get Data from Dataset (v2)") and a human-readable label. Use this endpoint to discover which datasets the current account has access to before building queries.

Note: Compared to "List Datasets (v1)", this version returns RFC 7807 application/problem+json error responses and includes an X-Request-ID correlation header.