Add Google Cloud Platform auth import

[HeavyWombat]

Fixes #420

Include k8s.io/client-go/plugin/pkg/client/auth/gcp import.

[codecov]

Codecov Report

Merging #421 (ad4b728) into main (3a4395d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #421   +/-   ##
=======================================
  Coverage   10.60%   10.60%           
=======================================
  Files          21       21           
  Lines        1725     1725           
=======================================
  Hits          183      183           
  Misses       1539     1539           
  Partials        3        3           

Flag	Coverage Δ
unittests	10.60% <ø> (ø)

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Impacted Files	Coverage Δ
pkg/havener/common.go	0.00% <ø> (ø)

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