[release-4.21] NO-JIRA: fix(awseps): cache local zone ID in non-shared VPC case

[openshift-cherrypick-robot]

This is an automated cherry-pick of #7409

/assign sjenning

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@openshift-cherrypick-robot: 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
ci/prow/okd-scos-images	8c8da7f	link	true	/test okd-scos-images
ci/prow/e2e-aws-upgrade-hypershift-operator	8c8da7f	link	true	/test e2e-aws-upgrade-hypershift-operator

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