Location not set properly in stateless query path

[obada-ab]

The location set in BigQueryOptions is not being respected in low-latency query path.

[obada-ab]

This is probably part of a bigger issue where location is not set properly for queries when a JobID with a set location is supplied. The method QueryRequest.toPb() is not setting the location for the request, even though it has a setLocation method. I think fixing this should resolve the issue.