Fix a crash where tiling is destroyed after a desk is removed from repo.

This cl ensures that tiling gets notified of desks being removed before
the desk gets destroyed, as this caused an interaction between the repo
and tiling to cause a crash.

Flag: com.android.window.flags.enable_tile_resizing
Flag: com.android.window.flags.enable_multiple_desktops_backend
Test: unit tests and on device testing
Bug: 414809501
Change-Id: I7c5e5044dc6483ce955f2cbb613a11c361715bfe