TriggerTest: last tests migrated to CA

Hello,

All tests of the TriggerTest package are now migrated to CA. One difference w.r.t. the previous behaviour, I'm not sure doWriteRDOTrigger=False is possible now, writing RDO_TRIG seems enforced: https://gitlab.cern.ch/atlas/athena/-/blob/main/Trigger/TriggerCommon/TriggerJobOpts/python/runHLT.py#L162-167

Cheers, Bertrand