R1:71c89bd0578d

Pass all adjacent card PHIDs from the client to the server when moving a card

Summary:
Depends on D20321. Fixes T12175. Ref T13074. Now that before/after PHIDs are suggestions, we can give the server a more complete view of what the client is trying to do so we're more likely to get a good outcome if the client view is out of date.

Instead of passing only the one directly adjacent card PHID, pass all the card PHIDs that the client thinks are in the same group.

(For gigantic columns with tens of…