Switch from N1 to E2 machine for cloudbuild

[sarab97]

Reference kubernetes/k8s.io#5059

This changes machine type from N1 to E2 which are newer but almost same pricing. But with E2 being more efficient and overall taking less time. The cost can be reduced.

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[cici37]

/lgtm
/approve
Thanks for the PR!

[cici37]

/assign @saschagrunert
for approval. Thank you^^

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cici37, sarab97, saschagrunert

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