Add new ML beamspot test to TrigInDetValidation
modified: Trigger/TrigValidation/TrigInDetValidation/share/TrigInDetValidation_RTT_topOptions_BeamspotSlice.py
new file: Trigger/TrigValidation/TrigInDetValidation/test/test_trigindetvalidation_beamspot_ttbar_pu80_zfinder_ml2_art.sh