Fonts and Connectors: remove no-JS notices

[wildworks]

Follow-up to #65690.

[62954] added the no-JS heading and notice to src/wp-admin/font-library.php and src/wp-admin/options-connectors.php. Gutenberg PR ​https://github.com/WordPress/gutenberg/pull/81365 moves that markup into the generated page template, so every wp-build page gets it automatically.

The per-page heading and notice should therefore be removed.

Removes the per-page no-JS heading and notice added in [62954], since the generated wp-build page template now renders them for every route-based page.

Depends on ​https://github.com/WordPress/gutenberg/pull/81365.

## Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5
Used for: Removing the markup per the ticket; reviewed and verified by me.

[hbhalodia]

Thanks @wildworks on followup for the ticket. My only question regarding this is the template would show the same message across all the pages that are build, while it would good to have some way where we can show the no-js message based on the context, how other pages show to be consistent? Could be a better UX. wdyt?

Update: This is cleared in - ​https://github.com/WordPress/wordpress-develop/pull/12946#issuecomment-5249412972

@hbhalodia Thanks for the review!

Do we need to show the context based message for UX?

I don't think so, as the H1 heading already indicates what the page is about.

[wildworks]

In 63174:

Administration: Remove no-JS notices from route-based screens.

The Fonts and Connectors screens no longer render their own heading and JavaScript-required notice. The generated page template now provides both for every route-based screen, so the per-screen markup only produced a duplicate heading and notice when JavaScript was disabled.

Developed in: ​https://github.com/WordPress/wordpress-develop/pull/12946

Follow-up to [62954].
Props hbhalodia, wildworks.
Fixes #65840.