TriggerJobOpts: remove legacy trigger Getters

Remove legacy trigger "Getters" that were used to configure the trigger in the RecExCommon-based reconstruction. This will fix one failing unit test in the RecExCommon removal (!68693 (merged)) but is otherwise independent.

For the record, the TriggerConfigGetter is still referenced in the following files, which all seem obsolete/unused:

DetectorDescription/GeoModel/GeoModelStandalone/DumpGeo/share/dump-geo.py
LArCalorimeter/LArCalibTools/share/LArPulseShapeRun.py
LArCalorimeter/LArExample/LArCalibProcessing/share/LArCalib_AutoCorrPhys_jobOptions.py
LArCalorimeter/LArMonTools/share/LArNoisyROMon_jobOptions.py
TileCalorimeter/TileMonitoring/share/TileRec_topOptions.py
graphics/VP1/VP1Algs/share/vp1.py