[Reader] Show custom lists directly if there are 2 or fewer items

[RenanLukas]

Fixes #20033

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To Test:

• Make sure you have more than 2 custom reading lists (you can see your lists here).
• Install JP and sign in.
• Open Reader.
• 🔍 Expand the dropdown menu: you should see the "Lists" submenu item, and when tapping on it you should see the names of your lists.

• Make sure you have 2 or less custom reading lists.
• Reload the Reader.
• 🔍 Expand the dropdown menu: instead of seeing the "Lists" submenu, you should see the custom lists items directly in the main menu.

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Regression Notes

1. Potential unintended areas of impact

   • None

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

   • Manual testing and updated unit tests

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

   • Updated ReaderTopBarMenuHelperTest.kt

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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 (strike-out the not-applying and unnecessary ones):

• 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)

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[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	pr20940-03b73d8
	Commit	03b73d8
	Direct Download	jetpack-prototype-build-pr20940-03b73d8.apk

Note: Google Login is not supported on these builds.

[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	pr20940-03b73d8
	Commit	03b73d8
	Direct Download	wordpress-prototype-build-pr20940-03b73d8.apk

Note: Google Login is not supported on these builds.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.94%. Comparing base (a24e5d1) to head (03b73d8).

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #20940   +/-   ##
=======================================
  Coverage   40.93%   40.94%           
=======================================
  Files        1519     1519           
  Lines       69554    69562    +8     
  Branches    11473    11474    +1     
=======================================
+ Hits        28473    28481    +8     
  Misses      38495    38495           
  Partials     2586     2586           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[thomashorta]

Thanks for the PR! LGTM!