Add NeNe HF generator configurations (D2H ccbar+bbbar gap2 QCDCR)

[Farsh86]

Summary

Add NeNe (Neon-Neon) counterparts of the existing OO HF generator
configurations for the D2H_ccbar_and_bbbar_gap2_QCDCR setup, to be
used for NeNe 5360 GeV MC productions.

Files added:

• MC/config/PWGHF/ini/GeneratorHF_D2H_ccbar_and_bbbar_gap2_QCDCR_NeNe.ini
  — copies the OO ini and only changes the [GeneratorPythia8] config
  path to point to the new NeNe .cfg.
• MC/config/PWGHF/pythia8/generator/pythia8_charmhadronic_with_decays_QCDCR_NeNe.cfg
  — copies the OO cfg and replaces the Beams block with the NeNe
  beams from MC/config/common/pythia8/generator/pythia8_NeNe_536.cfg
  (Beams:idA = Beams:idB = 1000100200, Beams:eCM = 5360.0,
  Beams:frameType = 1, plus the standard HeavyIon and
  ParticleDecays settings). All HF-specific settings (gap trigger,
  charm/beauty hadronic decays, custom resonance PDGs and masses) are
  preserved.

Test

Locally tested with the standard O2DPG MC workflow
(MC/bin/o2dpg_sim_workflow.py + MC/bin/o2_dpg_workflow_runner.py),
full chain MC → RECO → AOD:

• o2-sim Pythia8 external generator (NeNe ini) — passed for all 8 TFs.
• Geant4 transport (sgnsim) — passed.
• Digitization, reconstruction, AOD producer — passed.
• Final AO2D.root produced and merged.

Note: QED was disabled in the local test (--no-qed) due to a
reproducible segfault in ROOT v6.36-alice3 / Cling when loading
QEDepem.C in the local build; this is unrelated to the NeNe
configurations and does not affect the HF generator chain.

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[fgrosa]

Summary

Add NeNe (Neon-Neon) counterparts of the existing OO HF generator configurations for the D2H_ccbar_and_bbbar_gap2_QCDCR setup, to be used for NeNe 5360 GeV MC productions.

Files added:

* `MC/config/PWGHF/ini/GeneratorHF_D2H_ccbar_and_bbbar_gap2_QCDCR_NeNe.ini`
  — copies the OO ini and only changes the `[GeneratorPythia8]` config
  path to point to the new NeNe `.cfg`.

* `MC/config/PWGHF/pythia8/generator/pythia8_charmhadronic_with_decays_QCDCR_NeNe.cfg`
  — copies the OO cfg and replaces the `Beams` block with the NeNe
  beams from `MC/config/common/pythia8/generator/pythia8_NeNe_536.cfg`
  (`Beams:idA = Beams:idB = 1000100200`, `Beams:eCM = 5360.0`,
  `Beams:frameType = 1`, plus the standard `HeavyIon` and
  `ParticleDecays` settings). All HF-specific settings (gap trigger,
  charm/beauty hadronic decays, custom resonance PDGs and masses) are
  preserved.

Test

Locally tested with the standard O2DPG MC workflow (MC/bin/o2dpg_sim_workflow.py + MC/bin/o2_dpg_workflow_runner.py), full chain MC → RECO → AOD:

* `o2-sim` Pythia8 external generator (NeNe ini) — passed for all 8 TFs.

* Geant4 transport (`sgnsim`) — passed.

* Digitization, reconstruction, AOD producer — passed.

* Final `AO2D.root` produced and merged.

Note: QED was disabled in the local test (--no-qed) due to a reproducible segfault in ROOT v6.36-alice3 / Cling when loading QEDepem.C in the local build; this is unrelated to the NeNe configurations and does not affect the HF generator chain.

Hi @Farsh86 thanks a lot! Could you please also add the test macro equivalent to the one for OO https://github.com/AliceO2Group/O2DPG/blob/master/MC/config/PWGHF/ini/tests/GeneratorHF_D2H_ccbar_and_bbbar_gap2_QCDCR_OO.C? I forgot to tell you that each ini file should come with a test macro, which is needed to merge the PR.