feat(cockpit): Add incident badge on activities

- If there are any incidents in a process instance on the aggregated view
  of the corresponnding process definition any badge containing "!" will
  be displayed on the activities wich have the incidents.
- On the process instance view the corresponding incidents are shown too.
- Add some test cases

related to CAM-785
fix(cockpit): Show incident badge always as last

- fix that the badge which represents at least one incident will always be
  displayed as last one (behind other badges)

related to CAM-785
fix(variables): Show variables in instance view

- All variables are initially shown in the process instance view

related to CAM-780