Unified Dashboard: Refactoring Part 2 - Remove Tabs from viewmodel and view

[AjeshRPai]

Part of #
#19270

This PR

1. Removes the collapsing tool bar dynamic height logic
2. Removes the tracking with tab source logic from MySiteViewModel
3. Removes the quick start tab step from QuickStartRepository
4. Removes: the redundant MySiteMenuFragment and MySiteMenuActivity

To test:

Site header and cards are shown as expected

1. Login to JP app with an account having sites
2. Verify that the site header and all cards are shown
3. Click on More in Quick links, verify that the menu items are shown as expected

No sites empty view is shown

1. Login to JP app with an account having no sites
2. Verify that the empty sites view is shown

WP app dashboard is as expected

1. Login to WP with an account having sites
2. Verify that the site header is shown
3. Verify the items shown on dashboard is as expecte

Regression Notes

1. Potential unintended areas of impact
   Dashboard in WP/JP app is not shown correct

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

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

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.

UI Changes testing checklist:

• 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)

[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	pr19263-6e735be
	Commit	6e735be
	Direct Download	jetpack-prototype-build-pr19263-6e735be.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	pr19263-6e735be
	Commit	6e735be
	Direct Download	wordpress-prototype-build-pr19263-6e735be.apk

Note: Google Login is not supported on these builds.

[zwarm]

👍 @AjeshRPai - This one is looking good and works as expected. Nice refactoring.