#7587657 Unified Pages: Group virtual home page with generic pages

Proposed Changes

• Render the virtual home.html page (templates) in the /pages list if the homepage displays setting is set to “latest posts” and the active theme supports FSE.
• Use the unified-pages/virtual-home-page flag to control the feature

(Note the final layout is the above screenshot)

TODOs

• Do we need to increase the count of the published pages by 1 if the homepage is showing the Home template?

Testing Instructions

• Go to “Settings > Readings”, and set “Your homepage displays” to “Your latest posts”
• Go to “Pages”, and you will see the virtual page, Home, listed in “Published” tabs
• Search the page by “Home”, and you will see the Home page is still there
• Click on “…”, and you’re able to edit, view or copy the link of the Home page

Pre-merge Checklist

• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the “[Status] String Freeze” label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?

Related to #69011, #69158, #69171