Don't assume that graphicsLayer blocks run after effects

This CL relaxes code that previously assumed that effects were always
running before graphics layer code. This was the case before but it's
not the case anymore. Unfortunately, this also means that we lose the
ability to detect (and crash) when an AnimatedValue is read during
composition. To compensate this, AnimatedValue.value is now annotated
with @FrequentlyChangingValue, which at least provides a warning when it
is read during composition.

See b/432799675 for details.

Bug: 35368168
Test: atest PlatformComposeSceneTransitionLayoutTest
Test: atest AnimatedSharedAsStateTest
Flag: EXEMPT bugfix
Change-Id: Ia4f0c956d938d88c3d79ed0be516d94cdec22da7