Inline code quality: use popovers instead of tooltips

Proposal

We should use popovers instead of tooltips for the hover state of our inline code quality annotations feature (#2526 (closed)) because:

• it allows us to have more control over text formatting inside of the popover (vs tooltips)
• it might be less invasive than the tooltip/modal combo approach that we started with
• it could allow us to get rid of the modal altogether 🎉

Documentation

• Update documentation for feature with new image.