Migrating the InDetSimEventTPCnv TP Converters to use the new HepMcParticleLink

This commit updates the TP Converters which use `HepMcParticleLink_p1` to
properly initialize the new transient `HepMcParticleLink` class. It also
adds code to write the `SiHitCollection_p3` and `TRT_HitCollection_p4`
persistent formats (which use `HepMcParticleLink_p2`) to `SiHitCollectionCnv_p3`
and `TRT_HitCollectionCnv_p4` respectively.

HMPL-backward-compatibility fix for SiHitCollectionCnv_p2 from @arnaez.
(cherry picked from commit d3b8b24edb17ddb96f26a8feed92278d76fca9b9)

All existing `InDetSimEventTPCnv` unit tests are updated to use valid
`HepMcParticleLinks` and new unit tests for `SiHitCollectionCnv_p3` and
`TRT_HitCollectionCnv_p4` are added.