Fix fold/unfold animation on split shade and keyguard

Most of the animations were broken because of the recent
changes in the view structure and refactorings.

Bug: 334100546
Test: manual fold/unfold on lockscreen and split shade
  with and without 'migrate clocks to blueprint' flag
Test: atest UnfoldConstantTranslateAnimatorTest
Test: atest KeyguardUnfoldTransitionTest
Test: functional tests are planned in b/342375409
Flag: EXEMPT bugfix
Change-Id: I9472bf95ad3bf9e661b092f5d0b15b74299400f8