Update Journey Version Step Events XDM Mixin to add attributes related to CJM reporting

[nikshar]

What are the schemas that are affected by the issue

https://github.com/adobe/xdm/blob/master/extensions/adobe/experience/journeyOrchestration/stepEvents/journeyStepEventCommonFieldsMixin.schema.json

What are examples of products that are impacted by the issue Journey Orchestration, Customer Journey Management