BugFix: fixing MC event indexing scheme of links to MVD MC points

This merge request fixes the bug in the MC-links definition in the MVD digitizer.

Previously, an entry index of MVD link was defined as a global MC event index. It did not affect the simulations with only one transport input, but introduced bugs in the latter stages of reconstruction and analysis, when several inputs (collision, signal and beam) were used and the MC information was required.

added BugFix Simulation labels

requested review from @m.deveaux

assigned to @f.uhlig

approved this merge request

changed milestone to %OCT23

I think the bug fix is pretty clear. I set the MR to auto-merge because the fix is needed by the other MR.

enabled an automatic merge when the pipeline for ad008d27 succeeds

Dear @c.muentz, @m.deveaux,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged

added Ported label