calculate TRT RNN PID for all egamma GSF tracks

See merge request atlas/athena!38062

A few fixes for the hybrid MP+MT mode

See merge request atlas/athena!38066

EGamma ambiguity. Add a few comments, format a bit, use override final

See merge request atlas/athena!38068

MVAUtils, move small methods to .icc, use final, remove virtual when seem it is not needed

See merge request atlas/athena!38072

Remove unused extra_dep from MuonAGDD

See merge request atlas/athena!38081

Fix PileUpMergeSvc configuration

See merge request atlas/athena!38082

Add protection for four-vector retrieval

See merge request atlas/athena!38084

Make PileUpToolsAlg name configurable (temporarily)

See merge request atlas/athena!38085

LArCellRec+CaloRec+RecExTB: Removing LArCellRecalibration.

See merge request atlas/athena!38063

LArRawUtils: Enable thread-safety checking.

See merge request atlas/athena!38065

LArByteStream: Fix cppcheck warnings.

See merge request atlas/athena!38067

CommissionEvent: Enable thread-safety checking.

See merge request atlas/athena!38069

TrigBphysHypo: Fix placement of using declarations.

See merge request atlas/athena!38071

TruthParticleID: cmake cleanup

See merge request atlas/athena!38088

ExoticPhysTagTools: delete obsolete package

See merge request atlas/athena!38080

BPhysTagTools: delete obsolete package

See merge request atlas/athena!38078

AnalysisTrigger: cmake cleanup

See merge request atlas/athena!38076

MuonCombinedRecRTT: delete obsolete RTT validation package

See merge request !38075

WZSkims: delete obsolete D3PD skimming package

See merge request atlas/athena!38074

BoostedTopD3PDMaker: delete obsolete package

See merge request atlas/athena!38051

Higgs: delete unused DPD packages

See merge request !38048

CaloRingerAlgs: cmake cleanup, enable flake8

See merge request atlas/athena!38045

Reconstruction: cmake cleanup

See merge request atlas/athena!38043

Remove `atlas_depends_on_subdirs` and tidy external and library
dependencies. Enable flake8 where relevant.

This package was already made obsolete 6 years ago (see commit
7d3b01db) and has not seen any significant updates since.

Cleanup cmake configuration and delete two unused job options.

D3PDs are no longer used in physics analysis and replaced by
derivations.

Do not put using declarations in the global namespace in headers.

EGamma ambiguity. Add a few comments, format a bit, use override final, default dtor, removed unneeded finalize

Enable thread-safety checking.

1. Dropped the ReloadProxies incident. This incident was triggering condition callbacks
in hybrid workers just after fork, which was immediately resulting in crash.

2. Enabled hybrid MP+MT mode in Job Transforms