Make TrackRecoConfig more atomic #1

Thomas Streblerrequested to merge
tstreble/athena:TrkRecoConfig into main

The main InDetTrackRecoCfg method was a bit monolithic so far and could easily scare people. This is a first attempt at setting up more atomic independent functions to try to make the main method more clear. To be continued

Include also a small clean up of InDetTrackTruthCfg which was running twice with the CombinedInDetTracks just to produce outputs with different names.

Checked to leave Run 3 and Run 4 reco outputs unchanged.

FYI @christos

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