Make draft toggle idempotent

A community contributor proposed making /draft idempotent (!89874 (closed)) which will require a few separate steps

1. Add backend support for ready and a temporary idempotent draft method - we may not use this new draft method right away, but since it's a simple reverse, we should implement it at the same time
2. Add /ready as a quick-action
3. Reroute frontend, API, etc events to use the new idempotent actions
4. Confirm any side-effects or implicit expectations around toggling draft status on the DB record
5. Cleanup - migrate the idempotent draft method and remove the old code

Some brainstorming and discussion in thread !89874 (comment 992757722)