HybridGen/EventPool: small fixes, Add missing EventHeader propagation

[sawenzel]

The HybridGen needs to forward event headers from the underlying
generators.

In order to access these, we need to make a protected function public.
Also adding eventHeader treatment to BoxGenerator.

More fixes:

• clear particle container in EventPool
• do not modify particle statuses in HybridGen (lead to wrong Geant4 simulations)
• fix possible segfault in chosing EventPool file

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI for 8222c00 at 2024-12-14 13:19:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/O2Physics-latest/log
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:


## sw/BUILD/O2-sim-challenge-test-latest/log
./sim-challenge.logDetected critical problem in logfile mftreco.log
./sim-challenge.logmftreco.log:[14846:internal-dpl-ccdb-backend]: [12:19:04][ERROR] Exception while running: Fatal error. Rethrowing.
./sim-challenge.logmftreco.log-[14846:internal-dpl-ccdb-backend]: [12:19:04][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-mft-reco-workflow, device shutting down. Reason: Fatal error
./sim-challenge.log[14846:internal-dpl-ccdb-backend]: [12:19:04][ERROR] CCDBDownloader CURL transfer error - Timeout was reached
./sim-challenge.log[14846:internal-dpl-ccdb-backend]: [12:19:04][ERROR] CcdbDownloader finished transfer http://alice-ccdb.cern.ch/CTP/Calib/OrbitReset for 1546300800000 (agent_id: alissandra05-1734178742-hDz9SB) with http code: 0
./sim-challenge.log[14846:internal-dpl-ccdb-backend]: [12:19:04][ERROR] File CTP/Calib/OrbitReset could not be retrieved. No more hosts to try.
./sim-challenge.log[14846:internal-dpl-ccdb-backend]: [12:19:04][FATAL] Unable to find object CTP/Calib/OrbitReset/1546300800000
./sim-challenge.log[14846:internal-dpl-ccdb-backend]: [12:19:04][ERROR] Exception while running: Fatal error. Rethrowing.
./sim-challenge.log[14846:internal-dpl-ccdb-backend]: [12:19:04][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-mft-reco-workflow, device shutting down. Reason: Fatal error
./sim-challenge.log[ERROR] Workflow crashed - PID 14846 (internal-dpl-ccdb-backend) did not exit correctly however it's not clear why. Exit code forced to 128.
./sim-challenge.log[ERROR]  - Device internal-dpl-ccdb-backend: pid 14846 (exit 128)
./sim-challenge.log[INFO]    - First error: [12:19:04][FATAL] Unable to find object CTP/Calib/OrbitReset/1546300800000
./sim-challenge.log[ERROR] SEVERE: Device internal-dpl-ccdb-backend (14846) had at least one message above severity 5: Unable to find object CTP/Calib/OrbitReset/1546300800000
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/37}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/38}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/40}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/42}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/43}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/45}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/46}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/47}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/48}
./digi.log[ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/49}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/37}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/38}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/40}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/42}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/43}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/45}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/46}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/47}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/48}
./digi.log[8756:TRDDigitizer]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/49}
./digi.log[8762:TPCDigitizer_4]: [ERROR] Found duplicate input binding with different spec.:collisioncontext {SIM/COLLISIONCONTEXT/37}
[0 more errors; see full log]

Full log here.