Cancel the stash animation if the stash controller is destroyed before then

The TASKBAR_COLLAPSE CUJ is logged when folding the phone before it can't tell if it's folding or going to lockscreen unfolded before taskbar recreation flow kicks in. The animation never gets cancelled, reporting a CUJ that messes up the metrics

Bug: 362713428
Test: manual
Flag: EXEMPT bugfix
Change-Id: I132ad28da982e08edba1909bf9e747a43dc11a84