Adding support for portrait orientation in tutorial screens

If we're in landscape description and animation are positioned horizontally and otherwise vertically.
Note this change doesn't remove enforcing landscape orientation from AndroidManifest so for now it's still letterboxed in portrait.

Bug: 376020472
Test: screenshots
Flag: com.android.systemui.shared.new_touchpad_gestures_tutorial
Change-Id: I5618f8fd485e54614d739efc228d733afdef71b0