Disabling touchpad gestures during touchpad tutorial

It boils down to changing sysui state when Activity is started or stopped.

Fixes: 345207568
Flag: com.android.systemui.new_touchpad_gestures_tutorial
Test: TouchpadTutorialViewModelTest
Test: Open touchpad tutorial and see touchpad gestures are not working. They're working again after leaving tutorial
Change-Id: I18cb1308a270bfd80dcaf0e0f36548f904096883