[Reader IA] Simplify Reader Quick Start flow for new UX

[thomashorta]

Fixes #20109

• Remove unused code relative to the old top app bar and menu
• Update the Quick Start flow to auto-complete upon showing Snackbar message
• Update snackbar message for WP.com users to mention Subscriptions feed instead of Settings
• No longer try to go to Discover feed when doing the quick start flow

New message:

Use Discover to find sites and tags. Try selecting Subscriptions to view subscribed content and manage your subscriptions.

reader-ia-new-quickstart.mp4

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To Test:

Make sure you're not already logged in.

1. Install and log into Jetpack
2. Tap the option to go through onboarding, right after login
3. Tap the onboarding card on My Site Dashboard ("Get to know the app")
4. Tap "Connect with other sites"
5. Verify the Reader icon is updated in the first snack bar message
6. Verify tapping Reader shows a snackbar with the new message
7. Go back to My Site
8. Verify the onboarding task is considered completed

You can also go through the steps in #20109 and verify it no longer happens since we don't try to move to Discover anymore and just stay on the selected Feed.

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Regression Notes

1. Potential unintended areas of impact

   • Quick start flow issues

2. What I did to test those areas of impact (or what existing automated tests I relied on)

   • Manual testing, unit testing

3. What automated tests I added (or what prevented me from doing so)

   • Updated existing tests
   • Added tests for the new scenarios

---

PR Submission Checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

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Testing Checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• Talkback.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• Large and small screen sizes. (Tablet and smaller phones)
• Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

Generated by 🚫 dangerJS

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 24.2 ❄️. The due date for this milestone has already passed. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

Generated by 🚫 Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20130-1828b60
	Commit	1828b60
	Direct Download	wordpress-prototype-build-pr20130-1828b60.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr20130-1828b60
	Commit	1828b60
	Direct Download	jetpack-prototype-build-pr20130-1828b60.apk

Note: Google Login is not supported on these builds.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dc9d7c1) 73.87% compared to head (1828b60) 54.59%.
Report is 17 commits behind head on release/24.2.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/24.2   #20130       +/-   ##
=================================================
- Coverage         73.87%   54.59%   -19.28%     
=================================================
  Files                 9       14        +5     
  Lines               356      522      +166     
  Branches             42       52       +10     
=================================================
+ Hits                263      285       +22     
- Misses               75      219      +144     
  Partials             18       18               

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[RenanLukas]

Thanks for the PR, @thomashorta . It's working as expected. LGTM