Don't decay when it will be too slow

This CL makes the settle animation of STL swipe transitions feel better
by avoiding the case when the velocity is just high enough to reach the
target offset but still a bit too low, causing the settle animation to
be too slow.

The idea is to simply perform whichever of the spring or decay animation
will be the fastest. Unfortunately there are no APIs to know how long it
will take for an animation to reach the target offset for the first
time, so these durations have to be computed analytically. See
b/417444347#comment3 for details.

Bug: 417444347
Flag: com.android.systemui.scene_container
Test: atest SwipeAnimationTest
Change-Id: Ifb2ee648c6a3937050fcf27319b588b66c89a01b