[PWGJE] add parametrised model fast sim

[aimeric-landou]

For closure checks with regard to combinatorial background.

Added tests as requested in previous PR.

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[nzardosh]

@jackal1-66 could you take a look please and see if its ok from your end?

[jackal1-66]

Hello @aimeric-landou can you please move the ini files directly in the ini folder? That's our standard and the CI is not able to recognise you added generators configuration otherwise

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
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async-2024-ppRef-apass1
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async-2023-PbPb-apass5

[aimeric-landou]

I was missing one of the config files the simulations fetch from alien; I added it and closed/reopened the PR to get the tests to run again