Preserve block style variations when securing theme json

[dean]

I'd like to sync a GB PR that fixes an issue where block style variations are not preserved when securing theme json

GB PR: ​https://github.com/WordPress/gutenberg/pull/53466

Valid and safe block style variations were being removed by WP_Theme_JSON::remove_insecure_properties when securing the theme.json. When this was a problem varied depending upon site configuration, but out-of-the-box it was a problem for administrators on multi-site installs.

This change adds explicit processing of variations in remove_insecure_properties so that they won't get removed.

Trac ticket: [](https://core.trac.wordpress.org/ticket/59108)

@ramonjd, sorry I've been afk. What's the next step here?

Thanks for the ping! We're now looking for a core committer to give final review.

Though I think it might now be punted to 6.3.2 (?)

At any rate, I added it to the ​6.3.x board a while back so it's on the radar.

[isabel_brison]

In 56502:

Editor: Preserve block style variations when securing theme.

Adds the ability to process block style variations to the remove_insecure_properties function of theme json class.

Props dsas, ramonopoly.
Fixes #59108.

[isabel_brison]

Reopening for second committer review/committing to 6.3 release branch.

Committed to trunk in r56502; leaving the PR open pending commit to the release branch.