Configure trigger data conversion in new JO

Addresses: ATR-24520 to be expanded to cover Run3 (not sure how to test) and Run1.

Tagging @fwinkl @tamartin @rbielski A suggestion of which tests to run would be useful

Trigger/TriggerCommon/TriggerJobOpts/python/HLTTriggerResultGetter.py

@@ -3,7 +3,6 @@
 from AthenaConfiguration.AllConfigFlags import ConfigFlags
 from AthenaCommon.Logging import logging
 
-from AthenaCommon.AppMgr import ServiceMgr
 from RecExConfig.Configured import Configured
 
 from RecExConfig.RecFlags import rec