Merge 21.0.100 into 21.3 branch

This commit merges nearly all the changes that were made to the 21.0 branch between the release release/21.0.100 and the previous release release/21.0.99.

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

• !25081 (merged) : Add SimulateCavern simFlag, which can be used independently of CavernBG and cosmics simulation
• !25077 (merged) : Fix a problem of HnlSkimmingTool and code cleanup (ATLDHNL-21)
• !25066 (merged) : Sweeping !25041 (merged) from 21.2 to 21.0.
• !25053 (merged) : Added q440 test to TCT for pileup check
• !25036 (merged) : Add bunch patterns for Run 3 tests
• !25026 (merged) : Revert changes of SCT_FrontEnd.cxx of MR !20456 (merged) to fix ATLASSIM-4227
• !24990 (merged) : Add an ART test for qball digitization
• !24429 (merged) : Inner Detector Alignment Performance Monitoring to use MCP muon tagging
• !24967 (merged) : Fix beam conditions propagation for the standard digitisation (ATLPHYSVAL-619)
• !24920 (merged) : Make EventAuxInfo_v1 data members public
• !24921 (merged) : Set ParticleSimWhiteList to True by default in SimFlags
• !24931 (merged) : Sweeping !24861 (merged) from master to 21.0.
• !24796 (merged) : Low energy particle removal for FCS
• !24657 (merged) : Fix for test_athena_G4AtlasCosmic (ATLASSIM-4186)
• !24664 (merged) : DataHeader_p6 reading
• !24567 (merged) : Extra SM mesons
• !24627 (merged) : Sweeping !24584 (merged) from 21.3 to 21.0.
• !20456 (merged) : Sweeping !20374 (merged) from 21.3 to 21.0.SCT RDO updates for overlay MC (ATLASSIM-3903)
  Removed from sweep due to incompatibility:
• !24737 (merged) : Fix for broken HepMcParticleLinks seen during MDT_Digitization (ATLASSIM-4225)

Link to the full diff between release/21.0.100 and release/21.0.99 is available at https://gitlab.cern.ch/atlas/athena/compare/release/21.0.99...release/21.0.100

Generators/EvgenProdTools/share/G4particle_whitelist_Mesons.txt

+413   D_star(2010)+  2010.26 (MeV/c) meson D 0
+-413   D_star(2010)-  2010.26 (MeV/c) meson D 0
+423   D_star(2007)0  2006.85 (MeV/c) meson D 0
+-423   anti_D_star(2007)0  2006.85 (MeV/c) meson D 0
+10421   D0_star(2300)0  2300 (MeV/c) meson D 0
+-10421   anti_D0_star(2300)0  2300 (MeV/c) meson D 0
+10423   D1(2420)0  2420.8 (MeV/c) meson D 0
+-10423   anti_D1(2420)0  2420.8 (MeV/c) meson D 0
+425   D2_star(2460)0 2460.7 (MeV/c) meson D 0
+-425   anti_D2_star(2460)0  2460.7 (MeV/c) meson D 0
+415   D2_star(2460)+  2465.4 (MeV/c) meson D 0
+-415   D2_star(2460)-  2465.4 (MeV/c) meson D 0
+513   B_star0  5324.70  (MeV/c) meson B 0
+-513   anti_B_star0  5324.70  (MeV/c) meson B 0
+10523   B1(5721)+  5725.9  (MeV/c) meson B 0
+-10523   B1(5721)-  5725.9  (MeV/c) meson B 0
+10513   B1(5721)0  5726.1  (MeV/c) meson B 0
+-10513   anti_B1(5721)0  5726.1  (MeV/c) meson B 0
+525   B2_star(5747)+  5737.2  (MeV/c) meson B 0
+-525   B2_star(5747)-  5737.2  (MeV/c) meson B 0
+515   B2_star(5747)0  5739.5  (MeV/c) meson B 0
+-515   anti_B2_star(5747)0  5739.5  (MeV/c) meson B 0