What needs to happen?

As a request from GCS, update the user agent when connecting to the GCS Filesystem to include "(GPN:Beam)".

This way, GCS can better identify incoming traffic, and identify it as coming from Beam as opposed to any other source.

See where we set the application name for Java: https://github.com/apache/beam/blob/master/sdks/java/extensions/google-cloud-platform-core/src/main/java/org/apache/beam/sdk/extensions/gcp/options/GcpOptions.java#L503

Issue Priority

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

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