Fix search results scroll position

[ashiagr]

Description

This PR

• Updates scroll position to the start of the list on a new search
• Hides episodes on RSS podcast feed search

Warning
Targets release/7.35

Testing Instructions

Prerequisite: Enable search improvements (if you do not have valid google-services.json, return true from isFeatureFlagSearchImprovementsEnabled())

Scroll position

1. Go to podcasts or discover tab search bar
2. Search for a term
3. Notice that search results are shown
4. Scroll horizontally through the podcasts search results row so that the first visible item is not the first podcast in the search results
5. Update search term
6. ✅ Notice that the updated podcasts search results row scrolls to the first podcast in the results
7. Scroll vertically so that the first visible episode is not the first episode in the search results
8. Update search term
9. ✅ Notice that the updated search results row scrolls to the first item in the vertical list
10. Repeat step 4
11. Tap on a visible podcast
12. Navigate back to the search results screen
13. ✅ Notice that the scroll position is retained

Screencast

device-2023-03-29-123916.mp4

Hide episodes from RSS podcast feed search

1. Go to podcasts or discover tab search bar
2. Search for a RSS podcast feed
3. ✅ Notice that episodes are not shown and only the podcast for the RSS feed is shown in search results

Screencast

device-2023-03-29-124127.mp4

[mchowning]

Looks good and works well. 👍 Nice job!

[ashiagr]

Thanks for the review, @mchowning! I found both of your explanatory comments useful and accepted them. 🙌