FastCaloSim in G4: Drop diff-pool checks for MT jobs
diff-pool checks can show differences due to the different ordering of events in the output file. This is nothing to be concerned out, so disabling them for test_AtlasG4_FastCaloSim_MT.sh
and
test_AtlasG4_FastCaloSim_MTvsST.sh
Essentially a backport of !69612 (merged) to 24.0
Should fix ATLASSIM-7204