Expose wp_get_viewport_media_queries for custom block controls

[tellthemachines]

Trac ticket: https://core.trac.wordpress.org/ticket/66150

Use of AI Tools

Changes from PR WordPress/gutenberg#82741 copied with copilot/Kimi 3.0

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[github-actions]

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[ramonjd]

Not sure if it's appropriate, should we direct users in the docs to prefer this function over the class method? E.g., something like:

* Use this instead of calling WP_Theme_JSON::get_viewport_media_queries() directly, which is not a public API

[tellthemachines]

It shouldn't be necessary because the whole class is documented as not public. I assume anyone who doesn't read the class docs also won't bother to look for this function 😅

[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 63889
GitHub commit: f4c1a30

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.