refactor: code block decode html entities

[alexbarnsley]

Summary

https://app.clickup.com/t/11m1a5u

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Checklist

• I checked my UI changes against the design and there are no notable differences
• I checked my UI changes for any responsiveness issues
• I checked my (code) changes for obvious issues, debug statements and commented code
• I provided a screenshot of my changes to the component (if applicable)
• I regenerated the icons.html file and checked if my newly added icon is shown correctly (if necessary)
• I added an explanation on how to use the component to the readme (if necessary)
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[ItsANameToo]

This doesn't resolve it for inline code, see for example this on the same page as the codeblock:

[ItsANameToo]

@alexbarnsley please check if inline code rendering can also work with html entities, because using <div> in the markdown there would result in actual divs being constructed

[alexbarnsley]

@ItsANameToo I missed the inline ones. They use a separate renderer, that should now be covered now. I've also included a unit test to make sure the content is parsed correctly for block and inline

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