Add dump method to BubbleBarExpandedView and include it in Bubble dump

Flag: EXEMPT adding to dump methods
Test: manual - have bubble bar in stack and in overflow
             - adb shell dumpsys activity service com.android.systemui | grep -A 50 BubbleController
Bug: 416297086
Change-Id: I7047b82ff0df5c4d8b05312c13bf22d22d9b2f2a