R1:950e9d085b48

In ProfileMenu, put more structure between "stored/configured items" and "display items"

Summary:
Depends on D20356. Ref T13275. See also T12871 and T12949.

Currently, the whole "ProfileMenu" API operates around //stored// items. However, stored items are allowed to produce zero or more //display// items, and we sometimes want to highlight display item X but render stored item Y (as is the case with "Link" items pointing at `?filter=xyz` on Workboards).

For the most part, this either: doesn't work; or…