Add Z4D machine family pricing to GCE cloud provider

[mariafromano-25]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR adds pricing information for the new Z4D machine family to the GCE cloud provider in the Cluster Autoscaler. This ensures the autoscaler can accurately calculate costs and make price-aware scaling and auto-provisioning decisions for Z4D node pools.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

The prices introduced here (vCPU: $0.00875, RAM: $0.01) are the confirmed launch rates. Because the billing SKUs are currently in a pre-release state in the backend and returning dummy values, these hardcoded prices act as a realistic placeholder to prevent the autoscaler from miscalculating costs. An internal tracking bug (b/521945608) has been filed to remove these hardcoded overrides once the real SKUs are fully finalized after GA.

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[k8s-ci-robot]

This issue is currently awaiting triage.

If SIG Autoscaling contributors determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

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[mariafromano-25]

/retest-required

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mariafromano-25
Once this PR has been reviewed and has the lgtm label, please assign towca for approval. For more information see the Code Review Process.

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Details

Needs approval from an approver in each of these files:

• cluster-autoscaler/cloudprovider/gce/OWNERS

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[mariafromano-25]

/retest

[k8s-ci-robot]

@mariafromano-25: 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
pull-autoscaling-e2e-gci-gce-ca-test	8bbc8a5	link	false	/test pull-autoscaling-e2e-gci-gce-ca-test

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.

Details

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.