feat: [Dataplex] Allow Data Documentation DataScans to support BigQuery Dataset resources in addition to BigQuery table resources (#9093)

* feat: Allow Data Documentation DataScans to support BigQuery Dataset resources in addition to BigQuery table resources
docs: A comment for message `DataDocumentationResult` is changed
docs: A comment for field `table_result` in message `.google.cloud.dataplex.v1.DataDocumentationResult` is changed

PiperOrigin-RevId: 897564665

Source-Link: googleapis/googleapis@1991351

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