Polyflow: Handle Candidate-Updates

[darenegade]

Is your feature request related to a problem? Please describe. Task Updates of Candidate User and Candidate Groups are not transferred to process variables if executed from Cockpit.

Describe the solution you'd like.

• Listener on assignment event
• Reuse current Task-Create-Listener if possible
• Find correct Polyflow-Command to sent event
  • Commands
• Tests

Describe alternatives you've considered

Changes via process instance migration -> Time-consuming

acceptance criteria

• Changes to assigned groups / c-user or task scoped vars are reflected to the Task-Backend without Task-Migration

Additional context https://git.muenchen.de/digitalisierung/digiwf-support/-/issues/353

[darenegade]

Hey team! Please add your planning poker estimate with Zenhub @AnHo314 @darenegade @lehju @simonhir @StephanStrehlerCGI @dominikhorn93 @zambrovski