Broadcasts: Importer: Permit Divider and Heading HTML Tags

[n7studios]

Summary

When importing Broadcasts to WordPress Posts, dividers (<hr>) were removed, because they weren't in the list of permitted HTML tags. This happened regardless of the Disable Styles setting.

h4, h5 and h6 were also missing from the list, so their text was imported as plain text without the heading.

This PR adds hr, h4, h5 and h6 to the permitted HTML tags:

• When Disable Styles is disabled, dividers retain their inline styles.
• When Disable Styles is enabled, dividers are imported as <hr>, with inline styles removed.

Testing

• testImportBroadcastHTMLElements: Imports a mocked Broadcast containing every permitted element, plus elements that should be removed, with Disable Styles both disabled and enabled. Asserts that:
  • permitted elements are retained;
  • layout elements and inline styles are retained or removed, depending on the Disable Styles setting;
  • non-permitted tags are removed, retaining their text;
  • the title heading, <style> blocks, polls, the unsubscribe section, empty non-editable table cells and the tracking pixel are removed.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

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