Late escape Social block

[getdave]

Description

This is not a security problem. This PR simply moves escaping of all PHP output to be as "late" as possible. This means we avoid escaping variables until they are output in the HTML markup.

This is a WP Core best practice.

How has this been tested?

• add blocks
• check functionality is "as was"
• check all tests pass

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).
• I've updated related schemas if appropriate.

[getdave]

This PR now becomes "renaming a variable" and "removing a space character" so I'm not fussed about merging it. I guess we could if folks feel it's worth while 😄