map gke h100 megas to 'H100'

[asaiacai]

GCP recently introduced a3-mega instances with improved bandwidth instances. On GKE, such nodes are labeled as cloud.google.com/gke-accelerator=nvidia-h100-mega-80gb which was causing these to be recognized as H100-MEGA-80GB. This change fixes this.

Before

(sky) Andrews-MacBook-Air:skypilot asai$ sky show-gpus --cloud kubernetes
Kubernetes GPUs
GPU             QTY_PER_NODE            TOTAL_GPUS  TOTAL_FREE_GPUS  
H100-MEGA-80GB  1, 2, 3, 4, 5, 6, 7, 8  16          16               
(sky) Andrews-MacBook-Air:skypilot asai$ sky launch --cloud kubernetes --gpus H100:8
I 06-26 15:58:20 optimizer.py:1264] No resource satisfying Kubernetes({'H100': 8}) on Kubernetes.
sky.exceptions.ResourcesUnavailableError: Kubernetes cluster does not contain any instances satisfying the request:
Task<name=sky-cmd>(run=<empty>)
  resources: Kubernetes({'H100': 8}).

To fix: relax or change the resource requirements.

Hint: sky show-gpus to list available accelerators.
      sky check to check the enabled clouds.

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Manual test

(sky) Andrews-MacBook-Air:skypilot asai$  sky show-gpus --cloud kubernetes
Kubernetes GPUs
GPU   QTY_PER_NODE            TOTAL_GPUS  TOTAL_FREE_GPUS  
H100  1, 2, 3, 4, 5, 6, 7, 8  16          16               
(sky) Andrews-MacBook-Air:skypilot asai$ sky launch --cloud kubernetes --gpus H100:8
I 06-26 16:02:26 optimizer.py:695] == Optimizer ==
I 06-26 16:02:26 optimizer.py:718] Estimated cost: $0.0 / hour
I 06-26 16:02:26 optimizer.py:718] 
I 06-26 16:02:26 optimizer.py:843] Considered resources (1 node):
I 06-26 16:02:26 optimizer.py:913] ----------------------------------------------------------------------------------------------------
I 06-26 16:02:26 optimizer.py:913]  CLOUD        INSTANCE           vCPUs   Mem(GB)   ACCELERATORS   REGION/ZONE   COST ($)   CHOSEN   
I 06-26 16:02:26 optimizer.py:913] ----------------------------------------------------------------------------------------------------
I 06-26 16:02:26 optimizer.py:913]  Kubernetes   2CPU--8GB--8H100   2       8         H100:8         kubernetes    0.00          ✔     
I 06-26 16:02:26 optimizer.py:913] ----------------------------------------------------------------------------------------------------
I 06-26 16:02:26 optimizer.py:913] 
Launching a new cluster 'sky-adb3-asai'. Proceed? [Y/n]: n
Aborted!

[Michaelvll]

Thanks for fixing this @asaiacai! LGTM.