feat(MultiFingerMultiTap): Use a two-finger double tap instead of a two-finger...

feat(MultiFingerMultiTap): Use a two-finger double tap instead of a two-finger triple tap in magnification

NO_IFTTT=add the multi-finger multi-tap feature without syncing to the old state

Bug: 315264770
Test: manual
Test:atest FullScreenMagnificationGestureHandlerTest
Test:atest WindowMagnificationGestureHandlerTest
Change-Id: Ia5993d94f3782b9d805147d4caba6ff72966dbac