Describe the bug

In C8 an escalation boundary event should only be attached to a subprocess, or a call activity. In C7 you could also attach it to any service task. The tool does not report on that difference.

Steps to reproduce

1. Create C7 Diagram with Escalation Boundary Event on e.g. a User Task
2. Convert the Diagram
3. Open it in Desktop Modeler -> "An escalation boundary event should only be attached to a subprocess, or a call activity."

Expected Behaviour

Diagram Converter reports a warning.

Library version

0.9.0

Camunda Platform 7 version

7.20

Camunda Platform 8 version

8.5.3