Summary:
A lot of these blank imports were seemingly copy-pastaed.
vizier + operator work on many different kubernetes engines  and likely don't
need to rely on GCP auth.
We are also trying to ensure that pixie cloud works on a variety of environments
and should probably just import the entire auth package where needed.

Test Plan:
Ran a dev cloud + dev vizier + dev operator on my cluster.
Also tested a bazel built `px` cli

Reviewers: michelle, philkuz, zasgar

Reviewed By: zasgar

Differential Revision: https://phab.corp.pixielabs.ai/D9798

GitOrigin-RevId: fa747111015fb4c15e94fb7c3aa2e1e1e9d7fd84