End of Year: Show first and last story

[ashiagr]

📘 Project: #410

iOS PR: Automattic/pocket-casts-ios#420

Description

Adds the first and last story. The last story also adds a replay option.

Testing Instructions

1. Set END_OF_YEAR_ENABLED feature flag to true in base.gradle
2. Run the app and make sure you're logged in to an account with a few items on Listening History
3. When the prompt appears, tap "View My 2022"
4. ✅ Check that the first story contains a "Let's celebrate..." string
5. Tap on the right side to go to the next story
6. ✅ Check that it works
7. Advance to the last story
8. ✅ Wait for it to end, notice that the stories won't start over
9. Tap the "Replay" button
10. ✅ Check that the stories start again

Screenshots or Screencast

Intro story	Epilogue story

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews

I have tested any UI changes...

• with different themes
• with a landscape orientation
• with the device set to have a large display and font size
• for accessibility with TalkBack

[geekygecko]

This PR has already been reviewed by @MiSikora so just approving it so it can be merged.