Add possibility to apply signal filtering for MC with embedding

[fgrosa]

@sawenzel @marslandALICE this PR adds the possibility to filter out MCParticles originated from the background event in case of embedding, as discussed in O2-6320 and in this presentation.

MC labels of tracks and calo clusters are set to -1 if they are produced by removed MC particles.

I also verified that tracks and calo clusters produced by MCParticles from the signal event still have indices that point to the same particles as before.

Finally, the AO2D.root size after the signal filtering is approximately 35% of the one without.

[github-actions]

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[sawenzel]

Looks good to me.

In principle, we might not even need modification of O2DPG MC. We should already be able to inject the additional AOD option with a config file. But to be seen if this practical.