Notification removal with overflow bubbles

Intercept dismissal for overflow bubbles.

Remove notifications for inactive (not in stack and overflow)
bubbles cancelled or suppressed from shade.

Set "isBubble" SysUI flag
- false for inactive bubbles still in shade,
- true for bubbles promoted from overflow.

Account for overflow bubbles in event handling
- onEntryUpdated: remove overflow bubble if no longer a bubble
- onRankingUpdated: remove overflow bubble if blocked
- expandStackAndSelectBubble: promote overflow bubble then expand
- isBubbleNotificationSuppressedFromShade: check overflow bubbles

Update tests
Enable overflow flag

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Fixes: 151104690
Test: manual: cancel oldest bubble => oldest overflow bubble removed
Test: atest SystemUITests

Change-Id: I44bb623f99f9473055787cf10693f7a3bfd1c768