Document events being emitted for content flow actions

I would expect that long-running operations emit events in order to be notified upon completion or failure (otherwise one would need to rely on polling with https://developer.adobe.com/experience-cloud/cloud-manager/reference/api/#tag/ContentSets/operation/listContentFlows). Currently https://developer.adobe.com/experience-cloud/cloud-manager/reference/events/ only list the events for pipeline step operations.

Start by reviewing the Cloud Manager events reference and the ContentSets listContentFlows operation linked in the issue. Document the events emitted for content flow actions, with enough detail for users to monitor completion or failure without polling.

Written by the indexing model from the issue text.