Fix compiler warnings related to tracking tools

This MR will fix the compiler warnings coming from the TrackVertexAssociationTool and InDetTrackSelectionTool packages as follow-up from !21047 (merged).

Most notably, the setCutLevel() method of the InDetTrackSelectionTool is no longer public, requiring the "CutLevel" to be set in the job options.

Edited by David Richard Shope

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