Bug: Call Activity Output Mapping in Zeebe does not allow mix of "all" and dedicated mappings

[jonathanlukas]

Describe the bug

In C7, it was ok to define output mappings of a call activity with "all" and some additional mappings (although this would not make sense in most cases).

In C8, this is not allowed.

Steps to reproduce

1. Create a C7 diagram with a call activity and 2 output mappings: 1 all, 1 with defined mapping
2. On converting, both mappings are converted and still exist on the converted diagram

Expected Behaviour

It should

1. only take the all mapping and warn
2. only take the dedicated mappings and warn

Library version

0.7.0

Camunda Platform 7 version

7.20.0

Camunda Platform 8 version

8.3.0