Add Functional Tests for ScrollView Component

[chiaramooney]

Test cases should be added to the E2E test app (Fabric) to validate the following functionality scenarios.

### Tasks
- [ ] ScrollView should update styling upon fast refresh. 
- [ ] ScrollView should update header upon fast refresh.
- [ ] ScrollView should update footer upon fast refresh.
- [ ] ScrollView should update scroll direction upon fast refresh.
- [ ] ScrollView should scroll vertically when horizontal="false"
- [ ] ScrollView should scroll horizontally when horizontal="true"
- [ ] ScrollView should show end of list when scrollToEnd() is called.
- [ ] ScrollView should show desired location when snapTo* is called.
- [ ] ScrollViews should work when nested.
- [ ] Zoom?