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Handle reading in old TrackRecord persistent formats after the barcode migration.

John Derek Chapman requested to merge jchapman/athena:TrackRecordsAndXAODTruth_main into main

The idea here is to use an optional HepMcParticleLink member variable of the transient TrackRecord as a means to derive the correct id value from the provided barcode value in cases where the id value is not initially available from the persistent version (TrackRecord_p1).
NB This only works if the McEventCollection is present in the input file in addition to the TrackRecordCollection. This should be the case for all current use-cases though.
In the case that the id value is available from the persistent version (TrackRecord_p2) then no HepMcParticleLink is created. In the case that the transient TrackRecord instance is copied then the HepMcParticleLink is used to correctly set the m_id variable in the new object, if necessary.

Edited by John Derek Chapman

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