Unified Dashboard: Menu UI cleanup

[zwarm]

Parent #19270

This PR applies the following the the Menu view

• Updates general spacing/styling of items
• Adjusts the way the CustomXMLWidgetView is composed to reserve resources
• Extracts the composables out of the activity, but remains in the same fil
• Adds RTL support
• Create MenuItemState and swap that in for MySiteCardAndItem
• Add base unit tests for MenuViewModel

To test:

• Install the app
• Login and select a site
• Navigate to Quick Links Card > More
• ✅ Verify the view loads correctly and look good
• ✅ Verify the view looks the same in dark and light mode
• Change the app language to a RTL language (hebrew works great)
• ✅ Verify the view looks is shown RTL
• Go through the remainder of the UI checklist and verify all works as expected

Regression Notes

1. Potential unintended areas of impact
   The menu looks poorly

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

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 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 WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr19289-830b991
	Commit	830b991
	Direct Download	wordpress-prototype-build-pr19289-830b991.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	pr19289-830b991
	Commit	830b991
	Direct Download	jetpack-prototype-build-pr19289-830b991.apk

Note: Google Login is not supported on these builds.

[AjeshRPai]

Hey @zwarm

Everything looks good to me.

There is a minor issue that I can see with RTL, The Back arrow is not correct in Menu screen on RTL. I think MainTopAppBar is not implemented to handle the RTL. I can see the incorrect back arrow in screens which are using MainTopAppBar. We can take up in a seperate PR but I wanted to bring it up so that you are aware of this.

Approving and Merging this PR