Description
As per https://github.com/apache/beam/pull/12485 there's no way to override it, though Java does have one:
https://github.com/apache/beam/blob/master/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryOptions.java#L58
Let's add a good way to override this.