Add gke-gcloud-auth-plugin to kubekins-e2e-v2 image

[Qqkyu]

Part of #26609

Found when migrating scalability tests (kubetest + cl2) from kubekins-e2e to kubekins-e2e-v2.

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[k8s-ci-robot]

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[Qqkyu]

cc: @upodroid

[upodroid]

LGTM

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Qqkyu, upodroid

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