[Core] Move server-only env vars under SKYPILOT_SERVER_ prefix#9664

cg505 wants to merge 7 commits into

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cooperc/sky-5503-rename-server-only-env-vars-to-skypilot_server_-withskypilot-org/skypilot:cooperc/sky-5503-rename-server-only-env-vars-to-skypilot_server_-withCopy head branch name to clipboard