Removed reference to the EventInfo from the EventIncident and dropped the CheckIOV incident

As part of the migration away from the old-style event info, the reference to EventInfo has been removed from the EventIncident. The clients of EventIncident have been updated such that they now pass event information via EventContext, which is a data member of the Gaudi Incident class.

Several standalone algorithms (either test or conditions loading jobs) have been switched to direct usage of event contexts (via getContext()) instead of taking them from the incidents.

Also dropped the redundant CheckIOV incident.