Reader: Add "Your Tags" feed menu item

[wargcm]

Fixes #22954

Description

• Add the "Your Tags" feed (✅ feature flag)
• Separate menu items into sections (❌ feature flag)
• Update "Lists" feed icon (❌ feature flag)

Screenshots

Before	After

Testing

To test:

• Use an account which has > 2 lists
• Launch Jetpack and login
• Enable the "Reader Tags Feed" feature flag (may require restart)
• Navigate to Reader
• Tap on the navigation menu button
• 🔎 Verify there are dividers:
  • Before the "Saved" feed
  • Before the "Your Tags" feed
• 🔎 Verify the "Lists" feed has an icon and matches the design
• Tap on the "Your Tags" feed (Note: the feed doesn't do anything at this point, that will be a future PR)
• 🔎 Verify 🔵 Tracked: reader_dropdown_menu_item_tapped <id: tags> is sent

Regression Notes

1. Potential unintended areas of impact
   Should be none.

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

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

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• 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.

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.
• VoiceOver.
• 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)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[wpmobilebot]

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

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr22981-f9a648c
	Version	24.6
	Bundle ID	org.wordpress.alpha
	Commit	f9a648c
	App Center Build	WPiOS - One-Offs #9434

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

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

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr22981-f9a648c
	Version	24.6
	Bundle ID	com.jetpack.alpha
	Commit	f9a648c
	App Center Build	jetpack-installable-builds #8477

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[dvdchr]

LGTM!