AKModel: Admin actions for constraint violations

Bulk actions to

• Change level to violation
• Change level to warning
• Mark as resolved

changed milestone to %KIF 50,7

added feature label

assigned to @bhaettasch

marked the checklist item Change level to violation as completed

marked the checklist item Change level to warning as completed

marked the checklist item Mark as resolved as completed

mentioned in commit a7f89041

mentioned in merge request !133 (merged)

mentioned in commit 7536ac88

mentioned in commit f28e9606

mentioned in commit 84584d74

closed with commit f28e9606

closed with merge request !133 (merged)