3.7 Update Keyguard to use the modern Animation Library APIs.

For simplicity and scope, this CL only changes the affected
animation, while the rest that don't go through the Animation
Library remain tied to the old RemoteAnimationRunner APIs.

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.animation_library_shell_migration
Test: atest KeyguardViewMediatorTest KeyguardViewMediatorTestKt + manual
Change-Id: Ic4ce3b4229eeb9f3e5717e5baebc8a4e4aea4381