Add TruthMetaData to TRIG9 output
Quick MR to add TruthMetaData as output of the TRIG9 output.
Tested with a modified version of https://gitlab.cern.ch/atlas/athena/-/blob/main/PhysicsAnalysis/DerivationFramework/DerivationFrameworkART/DerivationFrameworkPHYS/test/test_mc20PHYS.sh and TruthMetaData added in output as expected
Edited by Antonio De Maria