Real-time collaboration files have shipped in 7.0

[johnbillion]

The real-time collaboration (RTC) files that were removed in #65205 have unintentionally shipped in the 7.0 package due to an issue with the build server not fully removing deleted files.

The wp-includes/collaboration files no longer exist in source control but they are present in ​the package zip file.

The impact is mostly benign as the files are not loaded via wp-settings.php or instantiated anywhere else, but the fact that this happened and nobody noticed it until after the release is a problem.

This is technically a meta issue but as it affects the released 7.0 package let's track it here too.

Status

• Not present in https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes
• Not present in ​https://github.com/WordPress/wordpress-develop/tree/7.0.0/src/wp-includes
• Fully present in 7.0 tag of ​https://github.com/WordPress/WordPress/tree/7.0/wp-includes/collaboration
• Present as empty files in trunk branch of ​https://github.com/WordPress/WordPress/tree/master/wp-includes/collaboration
• Present as empty files on ​https://core.svn.wordpress.org/trunk/wp-includes/collaboration/
• Present as an empty directory on ​https://develop.svn.wordpress.org/trunk/src/wp-includes/collaboration/
• Fully present in package at ​https://wordpress.org/wordpress-7.0.zip

Impact

• The developer.wordpress.org reference site is showing the collaboration classes as existing since 7.0.0. Example: ​https://developer.wordpress.org/reference/classes/wp_sync_post_meta_storage/
• The build server will likely break again when those files are reintroduced at a later date.

I've put this in the 7.0.1 milestone for visibility. I don't know if it's necessary to remove those files in 7.0.1.