AthenaConfiguration: Add event algorithms to AthAlgSeq (if it exists) by default
This MR cherry-picks the following MR from master into 24.0 as discussed therein:
AthenaConfiguration: Add event algorithms to AthAlgSeq (if it exists) by default
Closes ATEAM-825
See merge request !70488 (merged)
Edited by Alaettin Serhan Mete