Add edgereport mixin to analytics experience event

## What are the schemas that are affected by the issue
extensions/adobe/experience/analytics-experienceevent.schema.json

## What are examples of products that are impacted by the issue
All downstream of Analytics.

We are planning to add the edge region where an event was received. To achieve this end we would like to use the already created mixin.

Start with extensions/adobe/experience/analytics-experienceevent.schema.json and inspect how existing mixins are referenced. Locate the already created edgereport mixin and determine how it should be added to this schema. Done means the Analytics Experience Event schema includes the mixin that provides the edge region where the event was received.

Written by the indexing model from the issue text.