Add task menu item to move task to external display

Call SystemUiProxy.moveToExternalDisplay to move existing Overview task to desktop in external display

Bug: 372872848
Test: atest
NexusLauncherTests:com.android.quickstep.ExternalDisplaySystemShortcutTest
Flag: com.android.window.flags.move_to_external_display_shortcut
Change-Id: I096a9839956ab5cab86bd0aaabc625a8587ca42a