[K8s] Distinguish between H100 and H100 Mega

[romilbhardwaj]

In our GKELabelFormatter, we currently do not distinguish between H100 and H100 Mega (a3-highgpu vs a3-megagpu):

skypilot/sky/provision/kubernetes/utils.py

Lines 197 to 204 in 13f54eb

	if acc in ['H100-80GB', 'H100-MEGA-80GB']:
	# H100 is named H100-80GB or H100-MEGA-80GB in GKE,
	# where the latter has improved bandwidth.
	# See a3-mega instances on GCP.
	# TODO: we do not distinguish the two GPUs for simplicity,
	# but we can evaluate whether we should distinguish
	# them based on users' requests.
	return 'H100'

We should fix this - GKE/DWS users need a way to distinguish between the two GPU types to provision the right instance type for their use case.