Virtual page: Hide description and popover when the template is not able to resolve

[arthur791004]

Proposed Changes

• Now we're able to resolve the homepage template if the atomic site is private. So, this PR proposes to hide the description of the virtual homepage and change the copy of the popover.

Before	After

Testing Instructions

• Go to /home/<your_atomic_site>
• Go to Settings, and configure the Privacy to "private"
• Go to Themes, and activate the themes whose "Your homepage displays" is configured to "Your latest posts", e.g.: TT3
• Go to /pages

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• 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)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-ajp-p2)?

Related to #71375, #71541, Automattic/jetpack#28158

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-53214

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-53214&env=jetpack

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~115 bytes added 📈 [gzipped])

name   parsed_size           gzip_size
pages       +548 B  (+0.1%)     +115 B  (+0.1%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[taipeicoder]

LGTM!

Before	After

[fushar]

I'd suggest removing by editing the template to cut the word count and to make it consistent with the non-admin case above, what do you think?

[arthur791004]

Sounds good!

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/7712622

Thank you @arthur791004 for including a screenshot in the description! This is really helpful for our translators.

[a8ci18n]

Translation for this Pull Request has now been finished.