Add Trigger test using offline siSpSeededTrackFinder instead of FTF for the muon lrt trigger chain
Adding the setting useSiSPSeededTrackFinder (set to False by default) to: https://gitlab.cern.ch/baines/athena/-/blob/master-addOptionalSiSPSeededTrackFinderForLRT/Trigger/TrigTools/TrigInDetConfig/python/ConfigSettingsBase.py#L80
using the setting to optionally replace FTF with siSP in : https://gitlab.cern.ch/baines/athena/-/blob/master-addOptionalSiSPSeededTrackFinderForLRT/Trigger/TrigTools/TrigInDetConfig/python/InDetTrigFastTracking.py#L317
and a test that switches this on: https://gitlab.cern.ch/baines/athena/-/blob/master-addOptionalSiSPSeededTrackFinderForLRT/Trigger/TrigValidation/TrigInDetValidation/test/test_trigID_mulrt_siSP_staustau.py
This MR only affects the new test above as the option useSiSPSeededTrackFinder is False by default