Track when we fallback to default organization

By Cells 1.0 we need to ensure we have removed references to the default organization. The removal of default_organization as described in Remove default organization from current organi... (#474975 - closed) intersects many code flows. Due to the number of flows it is difficult to identify all cases. We will measure how many times the default_organization fallback is being called to better identify when we can remove the fallback.

A should track the total count of requests over time on production. But also logging the request path, controller, and action will be helpful.

https://docs.gitlab.com/ee/development/internal_analytics/internal_event_instrumentation/