[k8s] Share SSH jump pod across users in the same namespace

[romilbhardwaj]

We currently create a SSH jump pod per user, even if all of them use the same namespace:

skypilot/sky/clouds/kubernetes.py

Line 31 in b1d8c9d

SKY_SSH_JUMP_NAME = f'sky-ssh-jump-{common_utils.get_user_hash()}'

This should instead by based on the kubecontext hash (like we have in get_current_user_identity) so that different users sharing the same namespace should use the same SSH jump pod.

We may also need additionally handle keys and auth from different users on the same ssh jump pod.

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[github-actions]

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