[Test Scenario] Runner doesn't work with the XML Prolog

Any .scesim file with the xml prolog <?xml version="1.0" encoding="UTF-8"?> fails.

With https://issues.redhat.com/browse/KOGITO-6144, we automatically added the prolog to any created DMN/SCESIM/BPMN file.

The bug root cause is:
The unmarshalling phase searches for the `version="` pattern to retrieve the scesim version. Adding the prolog, the XML version is parsed as the scesim version.