Post Template. Return No results found in PHP to match JS.

[iandunn]

Description

Fixes #36224

How has this been tested?

Ran the reproduction steps in #36224 before and after the change.

Types of changes

Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[carolinan]

The pull request works as described, it adds the No results found. text to the front.

This works well for search result pages, but it needs to be optional because it does not work well in other scenarios:

• "Magazine" layout with multiple queries.
• Homepage with one design for sticky posts and one for standard posts.
• A query for latest posts (not the latest post blocks) in a site footer.
• A block pattern that displays a query for a specific category, part of a larger design.

Related: #32606
Additional comments on implementation:
#33523 (review)

[t-hamano]

I'm closing this PR since it seems to have been resolved by #38806.

@iandunn Thank you for working on this issue!