store origin navState instead of G4TouchableHandle in HostTrackData

[SeverinDiederichs]

This PR fixes the origin Touchable handling in the HostTrackData Mapper.

Before, there was a ! missing in this if-Statement:

  if (hostTData.originTouchableHandle) {
    leakedTrack->SetOriginTouchableHandle(*hostTData.originTouchableHandle);
}

Thus, the originTouchableHandle was never set. Fixing it, a major run time regression was found.
Indeed creating G4TouchableHandle is very expensive.
Therefore, now the vecgeom::NavState is stored in the hostTrackData and the G4TouchableHandle is only created when the track is returned to G4 from the GPU and not already per step.

This mitigates the impact significantly. In the extreme case of testEm3 where each second layer is a GPU region, the overhead was drastically reduced, in normal cases it was fully mitigated.

As the origin Touchable so far is only needed by ATLAS, one might see if it should be guarded as a compile time option.

Example	Master (with origin touchable)	No origin touchable	PR (with origin touchable)
Em3 Regions	142.28	89.9975	95.486
Em3	191.196	116.307	116.413

It was verified that this PR

• Changes physics results
• Does not change physics results

[phsft-bot]

Can one of the admins verify this patch?