4 Update the long-lived transition APIs.

Note that for simplicity I didn't flag these on the library side,
since they're already flagged in the only place that they're used
anyway (see below).

Trying to make each of the CLs as small as possible to keep them
digestible and low risk. For the refactor plan see
go/animlib-shell-refactor-plan.

Bug: 397180418
Flag: com.android.systemui.status_bar_chips_return_animations
Test: atest ActivityTransitionAnimatorTest LegacyActivityStarterInternalImplTest + manual
Change-Id: Ifdca8c23aa6ccd68d9e2909b0e77bdeebf543f01