Consume drag events on main dispatcher

Swiping up to bouncer should be processed on the main dispatcher,
to avoid delays in setting alpha on elements.

Also, remove the interpolator on swipe up. It looks too janky.
The result should be a smoother transition.

Bug: 393087652
Test: atest KeyguardInteractorTest
Flag: EXEMPT bugfix
Change-Id: Ie3710fe4526e4e571b16acb6e37744eac9d64393