Add ART tests for HLT Tier0-monitoring + small fixes in TrigValSteering
Adding a test running RDO->RDO_TRIG->ESD->AOD followed by Run-3 Tier0 monitoring for HLT, as requested in ATR-19520. The test is added in build version (20 events) and grid version (1000 events).
Since the last step uses the 'other' type of step in TrigValSteering, I had to also make some fixes there to make it work correctly. I adapted also one more test using the 'other' type, test_trigP1_BeamSpot_build.py
, following the fixes.