ALICE3: Adding parton level stack in simulations

[nzardosh]

No description provided.

[github-actions]

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[sawenzel]

I approved it ... yet the tests are still not starting. No idea what else needs to be done.

[nzardosh]

Thanks @sawenzel ! I guess the test failure is due to the tests not starting as with the other ALICE3 sims

[nzardosh]

Is it possible to force through the PR?