Late escape comment blocks

[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?

Check all comments blocks work "as was".

Check all tests continue to 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]

Looks like escaping has caused tests to fail. Perhaps I"m being over zealous here?

[cbravobernal]

Edit: after the last review done by @swissspidy , it seems that it is not ready for approval 🙇🏻‍♂️

There are still changes required here.

[getdave]

@c4rl0sbr4v0 I've dismissed your review in order that this doens't get merged when it's not yet finished. Much appreciated.

[getdave]

@swissspidy They changeset is now pretty limited. Let me know what you think.

[getdave]

Thank your time and patience @swissspidy and @aristath.