Release notes for release/21.0.125

This is the list of merge requests that were included since the previous release release/21.0.124:

!42930 : Reporting events which passed ISF_SimEventFilter for ReSim jobs (ATLASJT-417)
!42865 : Add property to scale xtalk between middle and back layer of LArEM
!42861 : Sweeping !42812 from 21.3 to 21.0.
!42789 : egamma ART change from master to rel21
!42474 : Sweeping !42384 from 21.2 to 21.0.
!42530 : additional histograms for egamma ART
!42307 : Add missing Charginos package to AthSimulation project
!42294 : Apply ZeroLifetimePositioner to all neutral mesons with oscillations: B0, B0s, D0
!42337 : Changes to propagate Pile-up xAOD::Truth information to HITS files
!42172 : Adding LAr cell DQ plots to UPC stream
!42332 : TCT: Increasing memory for AthenaMP tests and updating the comparison step
!41970 : Fix test_Sim_FullG4_ZPrime_QuasiStable.sh in AthSimulation nightlies
!42031 : Fix for ALFA_SimHitsTestTool (ATLASSIM-5034)