Send FSIs on ranking update when they are no longer suppressed by DND.

This change allows notifications with full screen intents to show that FSI on a ranking update if they meet specific criteria (previously suppressed only by DND; not older than a few seconds; now no longer suppressed).

FSI on update only happens when the flag FSI_ON_DND_UPDATE is set to true.

Bug: 248325248
Test: HeadsUpCoordinatorTest, manual verifying the FSI actually shows up on update

Change-Id: I810ae951bc96908cc66a8831f88730021bdb64b6