Write edit data directly to the GitHub issue

[zachlipton]

@space-buzzer had a really good idea for edits: we have all the edit data and metadata, and we have an optional GitHub issue URL, so we have everything we need to automatically write to the GitHub issue when an edit is pushed and published. This would save the Data Quality team a lot of time, especially if they can avoid the screenshotting, and keep the information in a standardized format.

We'd need to work out exactly what that standardized format looks like. Ideally, it would make sense to link out to the internal website for the diff, though I don't think we have exactly a view that would show a diff for an entire batch right now.