[QEE] ew_projects_Run3 : Centrally processed W31.34 MC

Supersedes nothing.

This MR processes the new centrally produced mc (lhcb-simulation/mc-requests!741 (merged)) further, first through sprucing and then into DaVinci as in !2013 (merged) which processed the 24c3 TurCal data again, this time including DecayTreeFitter variables and a few other minor changes.

This is technically in 'intent' going to supersede some MC samples from the previous ew_projects_Run3 AnaProds, but until we understand/ verify the performance with the centrally processed MC, we want to keep the 'self-processed' MC.

Changes

Non-physics:

• 77965386 : !2013 (merged)
• 6ad17272 : Add back MC processing jobs
• 0e1ce5e4, aac787ab, 761a2cb2 1fd50c63 : Remove redundant files, and keep only the relevant jobs in the info.yaml
• 3b2ca455, 1fd50c63 : Update mc db tag and mc platform
• 8c7a56aa : Fix annoying bug I introduced in this MR.

Physics

2a23f11a : Change particle location for MCDecayTree

• /Event/Spruce/Hlt2/MC/Particles -> /Event/MC/Particles
• The former is a subset of the latter, are used to understand MCTruth information in DecayTrees, and is related to what counts as 'Signal' in the Hlt2 processing.
• MC/Particles is instead just everything, and should be used for the MCDecayTree which should be 'agnostic' to the HLT reco/lines.
• I knew we needed this change for some time (https://gitlab.cern.ch/LHCb-QEE/ew/ew-analyses/-/issues/911#note_7806707), however the last attempt to do this didn't work as expected.
• https://gitlab.cern.ch/LHCb-QEE/ew/ew-analyses/-/issues/911#note_7955542 for more elaboration on the problem, but effectively the blockers in HLT and Sprucing should now be resolved.
• This MR's ci (https://gitlab.cern.ch/lhcb-datapkg/AnalysisProductions/-/pipelines/8477930) shows that 100% of the events found at HLT2 end up in the W/Z MCDecayTrees now. (and the centrally processed HLT1/HLT2 should have been run in flagging mode thus we should be getting exactly what we want.)

ToDo

• Verify MCDT stuff looks sane in recent pipeline
  • Saneish, some issues with decay descriptors still for Wtau/Ztau : https://gitlab.cern.ch/LHCb-QEE/ew/ew-analyses/-/issues/911#note_8737048
• Review from @/rjhunter