This merge request merges nearly all the changes that were made to the 21.0 branch between the release
[release/21.0.103](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.103) and the previous release
[release/21.0.102](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.102).

Below is a full list of merge requests that were accepted between these two tags:

 * !27400 : ISF_FastCaloSimParametrization: Fix cppcheck warnings.
 * !27162 : bug fixes in BS converters and monitoring related to missing ROB fragments
 * !27086 : Remove the word ERROR from log msgs (ATR-20369)
 * !26998 : Parametrisation and correction of the IBL module shape
 * !26808 : Trtaligntest
 * !26851 : Sweeping !26826 from 21.3 to 21.0.
 * !26873 : Fix outputHITSFIle to match art-output in test_MC16_FullG4_QS_ZPrimebb_ExtraParticles.sh
 * !27002 : Update on SCTLorentzMonTool and SCTHitEffMonTool
 * !27060 : Updating to branched externals tag with lwtnn 2.9
 * !26926 : FastCaloSim fix for root custom Streamer for TFCS1DFunction_Array
 * !26805 : Do not print FCS parametrization by default
 * !26792 : Fix output file naming in SimCoreTests and ISF_Validation ART jobs (ATLASSIM-4309)
 * !26704 : Save L1Calo information to RDO for overlay
 * !26561 : add a special stochastic term for hadrons to FastCaloSim lateral fluctuations
 * !26184 : Added TTree functionality for running over MC

Link to the full diff between [release/21.0.103](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.103) and
[release/21.0.102](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.102)
is available at
https://gitlab.cern.ch/atlas/athena/compare/release/21.0.102...release/21.0.103