Remove BubbleProperties

This was used to enable / disable bubble bar in tests prior to the
existence of the flag annotations, now that we have the flag annotations
we no longer need this.

Flag: EXEMPT removing trivial code
Test: make sysuig
Test: atest BubbleControllerBubbleBarTest BubbleViewInfoTaskTest BubbleBarLayerViewTest BubbleInfoTest BubblesTest
Bug: 390675904
Change-Id: Ia17310cdc5b4653037eaf7b2dfb9b0a3eca2acd9