Convert issue list checkboxes to native (#23596)
Use native instead of fomantic checkboxes in issue list. Benefits
include no more JS pop-in on load and perfect a11y.
Before, with JS pop-in:
<img width="92" alt="Screenshot 2023-03-20 at 17 02 02"
src="https://user-images.githubusercontent.com/115237/226398955-99029a1c-1150-449c-821b-e4165e7446a8.png">
After, Firefox on macOS:
<img width="126" alt="Screenshot 2023-03-20 at 17 01 26"
src="https://user-images.githubusercontent.com/115237/226399018-58df2c32-c2b2-4c78-b7df-7b76523abe21.png">
After, Chrome on macOS:
<img width="79" alt="Screenshot 2023-03-20 at 17 01 42"
src="https://user-images.githubusercontent.com/115237/226399074-947e6279-8dc3-42c2-90b5-b106c471b23d.png">
I opted to not do styling yet but I see that the inconsistency between
browsers may already be reason enough on doing it. I think if we style
them, there should be one global style, including markdown ones which
currently have custom styling.
