Draft: Parse task checkboxes in Markdown, part Ⅱ: The Checkboxening

Asherah Connorrequested to merge
push-npyysmsvtzsu into push-knxzwwunrvss

What does this MR do and why?

Stacked MR on top of Parse task checkboxes in Markdown, part Ⅰ: The ... (!219036).

That MR made no user-facing changes while putting into place the infrastructure required to solve Parse checkboxes in Markdown tables (#21506). This MR makes all the user facing changes.

Overview

TODO

Screenshots or screen recordings

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How to set up and validate locally

TODO

MR acceptance checklist

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