gce: refactor regional/global GCE API methods

[upodroid]

Google splits some services in to regional vs global with identical object types. I fixed the methods to detect if a region is being supplied.

Required for:

• gce: Switch from using targetpools to backend services #16233
• WIP: Integration branch for gce with dual load balancers #16249

Also, we don't have an e2e test for gce internal only clusters :( bit tricky to set one up.

/cc @justinsb @hakman

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[upodroid]

/test pull-kops-e2e-k8s-gce-cilium

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PR needs rebase.

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/lifecycle stale

[hakman]

/remove-lifecycle stale