We should only have one scheduling system in the product. We should deprecate and eventually remove the old max TTL-based approach to enforcing workspace shutdown. This should include some sort of warning in the UI and CLI.

• Add migration that denotes which of max_ttl or autostop_requirement is used for each template
• Update autostop code to use new table value
• Update UI to allow one of max_ttl or autostop_requirement (deprecate max_ttl)