Revisit how launch animations handle View visibility

This CL refactors the way the ActivityLaunchAnimator and
DialogLaunchAnimator handle the visibility of the animated View when
that View implements LaunchableView.

Before this CL, a View that is animated would always end up being
VISIBLE, even if something made that View INVISIBLE or GONE before or
during the animation. That is because our animation code would sometimes
change the visibility of the View, using View.setVisibility.

After this CL, when animating a LaunchableView, all the visibility
changes made to the animated View are done using
View.setTransitionVisibility instead. That way, a LaunchableView can
track all calls to View.setVisibility only and restore the last
visibility that was set on the View at the end of the animation. Doing
so ensures that all calls made to View.setVisibility have the expected
result once the animation is done.

Bug: 264728445
Test: DialogLaunchAnimatorTest
Change-Id: I5848d42ef94952ecf058d4e895164389e37e0311

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