Markdown: Revert changes in the current release (breaking behaviour tests at dotcom and it doesn't render as expected in narrow viewport)

[broccolinisoup]

• Revert "Fix MarkdownEditor focus variable usage and border bottom missing (Fix MarkdownEditor focus variable usage and border bottom missing #3911)"
• Revert "MarkdownEditor polish (MarkdownEditor polish #3667)"

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• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
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• Tested in Safari
• Tested in Edge
• Integration tests pass at github/github (Learn more about how to run integration tests)

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	104.2 KB (0%)
dist/browser.umd.js	104.74 KB (0%)