R1:760406762a6f

When a revision is closed, always promote it out of draft

Summary:
Fixes T13300. Currently, if you create a revision and then immediately land it (either using `--draft` or just beating Harbormaster to the punch) it can be stuck in "Draft" forever.

Instead, count landing changes like this as a publishing action.

Test Plan:
- Used `arc diff --hold` to create a revision, then pushed the commit immediately.
- Before change: revision closed, but was stuck in draft.
- After change: revision closed and…