Migrate DesktopVisibilityListener from RecentsView to RecentsViewUtils

Bug: 401002178
Flag: com.android.window.flags.enable_multiple_desktops_frontend
Flag: com.android.window.flags.enable_multiple_desktops_backend
Test: manually add and remove desks
Change-Id: I7a7b8b67eb2f84a83cef6fdd7d728967ab6a7c20
2 files changed