Play predictive animation when quickly restarting back gesture after cancel

Bug: 327579977
Flag: ACONFIG com.android.systemui.predictive_back_system_anims TRUNKFOOD50
Test: atest BackProgressAnimatorTest
Test: atest BackAnimationControllerTest
Test: Manual, i.e. extensively testing all three system animations with quick swipes in succession
Change-Id: Ia8815088240084ce22246baa6d3562812462ab19