no longer use states from fitResult in closestState

Gerhard Ravenrequested to merge
do-not-use-fitresult-in-closestState into master

This is a pre-cursor of !1691 (merged), which only implements the change in behavior of v1::Track::closestState, namely it no longer first checks the states contained in the TrackFitResult, and only considers states directly contained inside the track itself.

Edited by Marco Cattaneo

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