Remove/destroy status bar window view when display is removed

Doing this will release unneeded resources, and also make sure that
things stop when a display is removed.

Test: StatusBarWindowControllerImplTest
Test: MultiDisplayStatusBarWindowControllerStoreTest
Test: Manual - Add and remove virtual display. Make sure all the
      expected "stop", "onDestroy", etc calls are made
Flag: com.android.systemui.status_bar_connected_displays
Bug: 378872342
Change-Id: Iec15ad1d63005f669b7dba636cef27fbad054cf9