Add integration test for a3ultra-vm.yaml

[RachaelSTamakloe]

This PR adds an integration test for the a3ultra-vm.yaml blueprint. The integration test deploys the a3ultra-vm.yaml blueprint and runs nvidia-smi on remote_node: "{{ hostname_prefix }}-0".

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[tpdownes]

Can you please split the changes to modules/compute/vm-instance/* into a separate PR? Additionally, we've now introduced a situation where the following input variables may have user confusion:

• var.spot
• var.reservation_name
• var.reservation_bound

Let's discuss offline how to guide away from user confusion.

[tpdownes]

Approved anticipating the removal of changes to vm-instance module after #3588 is merged.