DO NOT MERGE Stagger the loading times of livedatas on Manage Standard screen

There are enough liveDatas going active that their collective "onActive"
calls are causing hangups when going back to it. Stagger the loading
(with allowance to immediately reload the permission group we just came
from), in order to mitigate this.

The max stagger should stay below 1 second. It's generally acceptable, as it only delays the time before the "X out of Y" number updates. The "firstLoadGroup" optimization ensures that the group most likely to change (the one we just came from) is loaded first.

Test: manual
Relnote: Improve performance of permission UI screens
Bug: 274057884
Change-Id: I539ff3110e72bef66170191481d6265467f2647c
(cherry picked from commit 3d9b62ce)