Remove reference to gutenberg_, swap with wp_

[kebbet]

Closes #36651

Description

In WordPress trunk an option is named gutenberg_.
https://core.trac.wordpress.org/ticket/54446
In https://github.com/WordPress/wordpress-develop/blob/trunk/src/wp-includes/blocks/calendar.php on line 103 (in the function block_core_calendar_update_has_published_posts) the option is named gutenberg_calendar_block_has_published_posts. Should it be called something else? The option is retrieved in the function block_core_calendar_has_published_posts some lines above, and may be updated as well.

Should be backported to WordPress 5.9.

How has this been tested?

Screenshots

Types of changes

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).

[SergeyBiryukov]

Thanks for the PR! The change looks good to me.