Add test scenario for the move to display keyboard shortcut

Bug: 385032739
Flag: com.android.window.flags.enable_move_to_next_display_shortcut
Test: atest PlatformScenarioTests:com.android.wm.shell.functional.MoveToNextDisplayTest
Change-Id: If18f69dc0301275e2e8c59c830244351958c75b7