Update Gesture nav tutorial.

- Seperated back left and right edge tutorial steps
- updated back left and right tutorial step strings
- Removed feedback view timeout
- Added accessibility focus on title when feedback view appears
- Added logic to show feedback when the tutorial fragment is stopped then resumed

Test: manual

Bug: 169687177
Fixes: 188116424
Fixes: 188115939
Fixes: 188124784
Fixes: 188555152
Fixes: 188972969

Change-Id: I97755a455bf3fa4674955d5cc91ed8b02f484b76