[release-1.36] Fix shared HC name eval to fix leak of shared HC firewall

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #1172

/assign hdp617

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[hdp617]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hdp617, k8s-infra-cherrypick-robot

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[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
cloud-provider-gcp-e2e-full	9fa80da	link	true	/test cloud-provider-gcp-e2e-full

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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