Update to GA for gVNIC support for compute instance

[edwardmedia]

Here is the beta
#7699

Here is the GA feature
https://cloud.google.com/compute/docs/networking/using-gvnic

Note:

Setting --network-interface=nic-type=GVNIC or "nicType": "GVNIC" is currently not supported for instance templates.

[edwardmedia]

Because google_compute_instance_template remains BETA, we have to handle it separately

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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