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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Default some unbound cluster/gce env vars **What this PR does / why we need it**: Sets defaults for two env vars used by cluster/gce/* scripts so as to avoid the following warnings when bringing a cluster up for test ``` METADATA_CONCEALMENT_NO_FIREWALL: unbound variable CUSTOM_KUBE_DASHBOARD_BANNER: unbound variable ``` **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes #60850 ```release-note NONE ```