[Bug]: Fix num_storage_api_streams for batch

[stankiewicz]

What happened?

Fix handling https://beam.apache.org/releases/pydoc/2.73.0/apache_beam.io.gcp.bigquery.html#apache_beam.io.gcp.bigquery.WriteToBigQuery num_storage_api_streams for batch.

1. update documentation and remove limitation about streaming only
2. handle translation to work also on bounded pipelines https://github.com/apache/beam/blob/master/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/providers/BigQueryStorageWriteApiSchemaTransformProvider.java#L186

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

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