Replace dataflow_v1b3_client with a Google Cloud Python client

[BjornPrime]

Replace references to the apitools-generated Dataflow client (sdks/python/apache_beam/runners/dataflow/internal/clients/dataflow) with analogous calls to Google Cloud Python clients. Google Cloud Dataflow should be the primary candidate, however it is still in beta as of this writing.

Please ensure that all client references are being thoroughly tested before swapping the GCP client in for the old client. The job is done when the old client can be safely deleted from Beam without impacting functionality.

Background:

apitools is deprecated and continued reliance on it is complicating Beam's dependency management. In order to remove it we need to replace the clients that it currently generates with Google Cloud Python clients, which are being actively maintained (and should be reasonably up-to-date in google3, though please confirm for any particular libraries you end up using.)

Tracking issue: #19073

Issue Priority

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

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