The Assistant gesture tutorial is unused in both the current and
redesigned gesture nav tutorials and can be removed. Left in, its
detections of gestures are leading to bugs with the tutorial.
Additionally, this change adds in error checking for side swipes in the
overview tutorial.
Flag: ENABLE_NEW_GESTURE_NAV_TUTORIAL
Fix: 280115831
Fix: 261239858
Fix: 278926113
Test: Manually went through both versions of gesture tutorial on
handheld, foldable, and tablet devices
Change-Id: Ie481d92ede2c2ab16ce2b3d1f729f6cb88f1b4c0
Saumya Prakash
94c8cf49cf