The big Keyguard transition refactor (7/n)

There was some window animation jank because we ran a layout during
the animation, as the SysUI animations are slightly faster, so we
collapsed the window already during the animation which caused
a layout which caused window animation jank.

Bug: 32057734
Change-Id: I296f961be8cfc39b08859b7d3d41f1e81b2eaaa3