Utilize tier 1 networking for higher bandwidth

[samos123]

Nodepools should default to using tier 1 networking: https://cloud.google.com/kubernetes-engine/docs/how-to/using-tier-1

This is critical especially for pathways CPU only nodepools.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[jamOne-]

Thanks, I'll create a feature request: http://b/456067605.