feat(notification): add comment on “old” MR to notify the assignees there is pending work

Only old MR (for now 10 days without activity), which are not wip, not client
related, and with an assignee, add a friendly comment.

closes: cubicweb/cubicweb#101
2 jobs for topic/default/notification in 1 minute and 12 seconds (queued for 12 seconds)
Status Job ID Name Coverage
  Lint
passed lint_black #86059

00:00:39

failed lint_flake8 #86060

00:01:11

 
Name Stage Failure
failed
lint_flake8 Lint
No job log