[MC] Scripts needed to run upcgen as external generator

[pbuehler]

Adding scripts which are required to use the event generator upcgen in O2 simulations.

[github-actions]

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The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
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async-2024-PbPb-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1

[nburmaso]

Hi @pbuehler,

Upcgen does not have this function. Do you have some local changes that you will commit later?

[pbuehler]

This is fixed and the method setLumiFileDirectory was implemented in Upcgen.

[pbuehler]

Dear @sawenzel, @benedikt-voelkel, @chiarazampolli, can I ask you to approve this PR please? It is needed to run the upcgen generator in O2 simulations. We want to use this in simulations for the UD group.