OKD 4.4: add a GCP test

[vrutkovs]

Run optional GCP test for fcos branch of installer

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci-robot]

@vrutkovs: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/rehearse/openshift/installer/fcos/e2e-gcp	17e5cea	link	/test pj-rehearse
ci/prow/pj-rehearse	17e5cea	link	/test pj-rehearse
ci/prow/app-ci-config	17e5cea	link	/test app-ci-config

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.

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[vrutkovs]

Superseded by #6976