[k8s] Backward compatibility between SkyPilot version and k8s image

[romilbhardwaj]

We need better versioning for our Kubernetes base images. After #2556, we moved our Kubernetes image versioning to images.csv in skypilot-catalog repo. Currently it defaults to fetching :latest image tag.

However, this is problematic since the latest image may be updated over time, and these changes may contain breaking changes. Example: #2826 (comment)

In addition to using specific version tags for images, we may need to go back from keeping the images.csv in the catalog to tying specific SkyPilot version to specific images (since a user catalog update may render their current SkyPilot version unusable on Kubernetes).

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