Self-assign hotspots(5.3.4)

Projects where self-assignment (an actor picking up a ticket without it being explicitly assigned to them) happens disproportionately often. The rate counts only assignee changes made by people, so an automation rule that assigns issues does not pull it down; changes by apps, service-desk customers and accounts Jira returned no type for are shown beside it. Healthy in self-organizing teams; suspect in teams with formal assignment processes. Counts only projects that had at least one assignee change in the selected period; a project with no assignee changes is not counted either way.