[12.6.X] re-initialize geometry in g4e propagator as required at beginning of propagation and for each step

[mmusich]

PR description:

Adds necessary re-initialization of the geometry navigation to the G4e propagator to avoid seg-faults/undefined behaviour.
This should fix the underlying cause of #31920

PR validation:

These initialization changes were verified to prevent segfaults in a customized version of the propagator in CMSSW_10_6_X in the context of muon calibration for mW.

For this PR directly, only checked that TrackPropagation/Geant4e/test/simpleTestPropagator_cfg.py still runs.

If this PR is a backport please specify the original PR and why you need to backport that PR. If this PR will be backported please specify to which release cycle the backport is meant for:

backport of #40543 for 2022 data analysis.

[cmsbuild]

A new Pull Request was created by @mmusich (Marco Musich) for CMSSW_12_6_X.

It involves the following packages:

• TrackPropagation/Geant4e (simulation)

@cmsbuild, @civanch, @mdhildreth can you please review it and eventually sign? Thanks.
@VourMa, @felicepantaleo, @JanFSchulte, @VinInn, @mmusich, @mtosi, @ebrondol this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

[mmusich]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-0f62f1/30130/summary.html
COMMIT: 31d2c4a
CMSSW: CMSSW_12_6_X_2023-01-23-1100/el8_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/40593/30130/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 5 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3458651
• DQMHistoTests: Total failures: 6
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3458623
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 47 files compared)
• Checked 206 log files, 158 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[civanch]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_6_X IBs (tests are also fine) and once validation in the development release cycle CMSSW_13_0_X is complete. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @rappoccio (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1

[mmusich]

type bug-fix