Update the centrally managed references at T0 to run 474926
As discussed in ATR-29347, and also at recent DQ meetings, we would like to make run 474926 the new Centrally Managed Reference for all systems at T0.
Test displays (data and reference should be the same):
https://atlasdqm.cern.ch/webdisplay/test/19871/express_express/run_474926/run/ (express_express)
https://atlasdqm.cern.ch/webdisplay/test/19871/physics_Main/run_474926/run/ (physics_Main)
This MR will also update the HLT/HLTegamma/collisions_run.config file, so that the HLTEgamma config uses the current (456729) reference.
It would be good if this could be merged promptly, so that the new reference cane used as soon as possible. We are currently still using the last good run from 2023 as our reference.
Thanks!
Tagging @ebergeas, @sawyer, @cmerlass, @tnobe for information