Fix Block Processor for Multibyte Processing and Synced Patterns

[rleeson]

Description of the Change

A couple issues were identified with HeadstartWP's WordPress plugin side:

1. Attributes on synced block patterns were being overwritten with core/block instead of the correct inner blocks, as well as nesting any block past the first in a Synced pattern underneath the first block. <h2></h2><h3></h3><p></p> => <h2><h3></h3><p></p></h2>
2. Could not process multi-byte encoded characters

How to test the Change

Synced Patterns

1. Add a Block Pattern to any page with more than one block in it, ensure the Synced checkbox is enabled.
2. Save the Post and view the page on the REST API to ensure the Synced Pattern in content.rendered shows as the correct blocks with correct data-wp-block-name and that they are not inappropriately nested.

Multibyte Characters

1. Include a block like following on a page:

   <!-- wp:paragraph -->
   <p>The temperature is 23°C ☀️ (sun emoji) and © (copyright symbol). HTML entity for Degrees: &#176;.</p>
   <!-- /wp:paragraph -->
   

2. Ensure the content show properly encoded on the REST API.

Changelog Entry

Added - Improved tests for the Gutenberg block attribute processing
Fixed - Gutenberg post content block attribute processing for Synced Patterns and support for multibyte characters.

Credits

Props @rleeson

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[changeset-bot]

🦋 Changeset detected

Latest commit: 98b66bf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@headstartwp/headstartwp	Patch

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[nicholasio]

Code looks solid!