cloudbuild: upgrade to E2_HIGHCPU_32 to fix session timeout

[Ganiredi]

Multi-arch builds (linux/amd64 + linux/arm64) take ~12 min on N1_HIGHCPU_8, causing the BuildKit session to expire before the push phase completes:

error: no active session: context deadline exceeded

Other K8s repos with large multi-arch binaries (aws-ebs-csi-driver, cloud-provider-gcp) use E2_HIGHCPU_32 which completes builds in ~3-5 min, well within the session window.

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/kind bug
/kind cleanup
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/kind documentation
/kind failing-test
/kind feature
/kind flake

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[k8s-ci-robot]

This issue is currently awaiting triage.

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Hi @Ganiredi. Thanks for your PR.

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[kmala]

/ok-to-test

[kmala]

/release-note-none

[Ganiredi]

/test pull-cloud-provider-aws-e2e-kubetest2-quick

[kmala]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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