Fix the FastSim input MinBias for PU samples

[fabiocos]

The FastSim code migration made before 10_1_0_pre1 build with #20666 is breaking the existing relVal wf with PU because the old MinBias files are incompatible, content-wise, with the new code (different collection name because of different producer name).
10_1_0_pre1 FastSim files should replace the old ones in PyReleaseValidation to prevent crashes.

[cmsbuild]

A new Issue was created by @fabiocos Fabio Cossutti.

@davidlange6, @Dr15Jones, @smuzaffar, @fabiocos can you please review it and eventually sign/assign? Thanks.

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[fabiocos]

assign pdmv

[cmsbuild]

New categories assigned: pdmv

@fabozzi,@prebello,@GurpreetSinghChahal you have been requested to review this Pull request/Issue and eventually sign? Thanks

[fabiocos]

Dear PdmV experts, when do you expect we can have the files and the corresponding fix in the IB?

[prebello]

Dear @fabiocos
The requested input
/RelValMinBiasFS_13_ForMixing/CMSSW_10_1_0_pre1-100X_mcRun2_asymptotic_v2_FastSim-v1/GEN-SIM-RECO
is announced.
It will be tested in the latest IB to open PR with FastSim and GENSIM string updates in 10_1_X, all by tomorrow (Friday).

[fabiocos]

@prebello excellent, thanks, as soon as tests are fine please post a PR, so as we can have running wfs hopefully by the week-end

[prebello]

Dear @fabiocos please consider to merge #22255 and #22256 together. Thank you

[fabiocos]

@prebello they are now both merged