This commit updates the TP Converters which use `HepMcParticleLink_p1` to
properly initialize the new transient `HepMcParticleLink` class. It also
adds code to write rather than just read the `LUCID_SimHit_p2` persistent
version of `LUCID_SimHit` which uses `HepMcParticleLink_p2`. This pulls
in the remaining changes from `LUCID_EventTPCnv-00-07-01`. This is part of
the `HepMcParticleLink` migration. See ATLASSIM-2430.

Additionally add a unit test for `LUCID_SimHitCnv_p2` and update the
`LUCID_EventTPCnv` unit tests to use valid `HepMcParticleLinks`.