Review members and their precision in new Track class

The following discussion from !1533 (merged) should be addressed:

@sstahl started a discussion: (+1 comment)

  • Remove Likelihood and ghostprobability as they are only set after the track fit.
  • Remove TrackFitResult
  • Remove extra info

I think these can be trivially removed as they are not used anywhere or only in or two places and then the use is questionable, e.g. using extra info in PrForward.

  • Review the other members.
Edited by Sascha Stahl
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