[release-1.2] 🌱 Switch cloudbuild.yaml to e2 machine type

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #8428

/assign fabriziopandini

[k8s-ci-robot]

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[killianmuldoon]

/close

Unsupported branch - AFAIK cloud-build only runs on main.

[k8s-ci-robot]

@killianmuldoon: Closed this PR.

In response to this:

/close

Unsupported branch - AFAIK cloud-build only runs on main.

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