Take snapshots of desktop tasks on disconnect.

When a display disconnects and before the transition is ready, take
snapshots of the tasks in the desk.

Also prevent taking snapshots if there is a bounds change in a
vis to invis transition as the app won't redraw.

Bug: 438439090
Test: Manual testing of snapshots && atest DesktopTasksControllerTest
Flag: com.android.window.flags.enable_display_reconnect_interaction
Change-Id: Iba09c5d419670e6f84653c802ed0700b1d6c37cb