Phabricator: https://phabricator.wikimedia.org/T380433

Notes

• Adds a local flag to indicate if the user reached the second slide
• User is then eligible to see the survey
• Survey display logic remains as-is, is not shown again if user already seen
• We're checking for the slide of index 1, which the second item in the in 0-based array it's stored

Test Steps

1. Fresh install the app, go to YiR
2. Go to the second slide, return to the first
3. Leave YiR
4. You should see the survey
5. Fresh install the app again, go to YiR
6. Go to the last slide, tap finish
7. You should see the survey
8. Fresh install the app again, go to YiR
9. Leave YiR at any point from the 2nd slide, you should see the survey
10. Enter and leave YiR, the survey should no be displayed