Add VM termination annotation; switch to Compute Beta API

[dsafdsa1]

All of the VMs provisioned by Provisioning Requests have bounded TTL, which is 7 days by default and can be lowered by users via maxRunDurationSeconds in Provisioning Request (https://cloud.google.com/kubernetes-engine/docs/how-to/provisioningrequest).

We would like to surface information about TTL to the GKE users using k8s API, as it is not presented to them directly.

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[mimowo]

LGTM, just non-blocking nits

[mimowo]

/lgtm
Thanks

[vinayakankugoyal]

Can you add details of why this change is necessary?

[dsafdsa1]

Can you add details of why this change is necessary?

@vinayakankugoyal
Done.

[vinayakankugoyal]

Could you elaborate on why this needs to be beta? What is the risk of switching from stable to beta APIs?

[aojea]

that is concerning indeed

[dsafdsa1]

I believe the question has been answered in the design doc, if you can have a look again please @vinayakankugoyal

[vinayakankugoyal]

/ok-to-test

[vinayakankugoyal]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dsafdsa1, vinayakankugoyal

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