Relates to https://issues.redhat.com/browse/NOTIF-206

Insights events were previously sent to all subscribed users of the organization. This feature is for bundle/app to specify that the event is sent to all administrator users only. This was specifically requested by OpenShift and Managed services teams.

trigger events related to sub-group of users (e.g. organization admins only).

Requested by Jerome in [Notifications Jira review|https://docs.google.com/document/d/1zY4feyVk-UQ_vUa3oAhWMPloeNm7kmEuP_YUA1FhGOs/edit?usp=sharing|https://docs.google.com/document/d/1zY4feyVk-UQ_vUa3oAhWMPloeNm7kmEuP_YUA1FhGOs/edit?usp=sharing]