R1:67629aab14b3

Implement a rough optgroup-based "Move on Workboard" stacked action

Summary:
Ref T6027. Try this out and see how it feels? Clear issues:

- This definitely shouldn't be at the top.
- You should probably be able to select it multiple times?
- Some of the "which columns show up" rules might need adjustment?
- Diamond marker maybe not great?

Not sure I love this but it doesn't feel //terrible//...

Test Plan: {F1207891}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T6027

Differential…