Fix a crash where tiling animations are not canceled on resetting.

This CL fixes a crash where overview animations would trigger a tiling
animation wrongly, and then in the unlikely case of a task vanishing,
the divider view would cause a crash as tiling resources are destroyed
during an animation.

Flag: com.android.window.flags.enable_tile_resizing
Test: unit tests and on device testing
Bug: 409602968
Change-Id: I6a153b3386d505c6e38f4ffac96df4008f6fb5da