[kn-plugin-workflow] Implement 'kn workflow quarkus convert' documentation

[domhanak]

Goal
Include procedure on how to use kn workflow quarkus convert in the documentation overview of kn cli plugin.

Target: https://github.com/apache/incubator-kie-kogito-docs/blob/main/serverlessworkflow/modules/ROOT/pages/testing-and-troubleshooting/kn-plugin-workflow-overview.adoc