Sometimes bugs come back or are not fixed all the way. We want to
preserve the context of the issue we've closed prematurely so instead of
always making people open a new github issue in this case we want to be
able to notice if someone* comments on a closed bug and decide what to
do about it.

Before:

Bug is closed → A user can again/still reproduce it on a new version and
leaves a comment → Maybe someone sees the notification about it, maybe
not; maybe they see it but forget to act on it right away and it's lost.

After:

Bug is closed → A user can again/still reproduce it on a new version and
leaves a comment → The issue is added to a project board where it's
visible until someone makes a call about it (maybe the comment was “oh
my glob i'm so happy this was fixed” and no action is needed, or maybe
the issue must be reopened as a regression).

*Someone in this case means (1) not a bot, (2) not a member of staff.

Release Notes:

- N/A