BigQueryStorageStreamSource reader quota issues at split time
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Description
The [BigQuery Storage API](https://cloud.google.com/bigquery/docs/reference/storage) returns an empty SplitStreamResponse when a stream cannot be split any further. The BigQueryStorageStreamSource reader should honor this response and not make further split calls for a stream when such a response is encountered; continuing to attempt splits leads to unnecessary quota exhaustion for management plane API calls.
Imported from Jira [BEAM-9675](https://issues.apache.org/jira/browse/BEAM-9675). Original Jira may contain additional context.
Reported by: kjung520.
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