Make GCE backend service regional for the Terraform target

[tesspib]

kops' cloudup target for creating/updating a GCE cluster creates a regional backend service, which is on par with the forwarding rule being regional. The Terraform target however creates a global backend service and a regional forwarding rule, a combination that's not supported by GCP.
This PR aligns the Terraform target to the cloudup one and fixes the failing terraform apply.

[k8s-ci-robot]

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[hakman]

/ok-to-test
/cc @justinsb
/assign @justinsb
/kind office-hours

[tesspib]

This issue is also present in kops 1.29, which introduced internal load balancers, and imo the fix should be backported (provided it passes tests, of course)

[k8s-ci-robot]

@tesspib: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-test	e4ca36c	link	true	/test pull-kops-test
pull-kops-verify-terraform	e4ca36c	link	true	/test pull-kops-verify-terraform

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.