Merge release/21.0.101 into 21.3

This commit merges nearly all the changes that were made to the 21.0 branch between the release
[release/21.0.101](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.101) and the previous
release [release/21.0.100](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.100).

Below is a full list of merge requests that were accepted between these two tags:
 * !25182 : Backport ATLASG-1450 fix to 21.0
 * !25133 : Migrate the MuonCandidateTool to use the BeamCondSvc
 * !25177 : Sweeping !25143 from master to 21.0.

Link to the full diff between [release/21.0.101](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.101) and
[release/21.0.100](https://gitlab.cern.ch/atlas/athena/tags/release/21.0.100)
is available at
https://gitlab.cern.ch/atlas/athena/compare/release/21.0.100...release/21.0.101