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Fixes for McParticleEvent unit test

John Derek Chapman requested to merge jchapman/athena:McParticleEventUnitTestFixes_ATLASSIM-4586_master into master

After the updates in !32855 (merged) it is necessary to record the McEventCollection being linked to in StoreGate.

Also patched the TruthParticleContainer, so that it is explicit that the position of GenEvent objects within the McEventCollection rather than the GenEvent::event_number is being used to create HepMcParticleLink objects.

Should fix ATLASSIM-4586.

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