Fix Avalanche HUN replacement when critical HUN arrives

The existing behavior: FSI and Remote Input activated HUNs are never
replaced by another HUN.
Behavior wanted: any HUN can be replaced by critical HUNs (FSI HUNs,
incoming calls, and user-pinned HUNs)

Bug: 403301297
Test: AvalancheControllerTest
Flag: com.android.systemui.avalanche_replace_hun_when_critical
Change-Id: Icaac02f6af25eace7226895bf436359409890564