Clean up unused InDetTrackSelectionTool in IPTag

Thomas Streblerrequested to merge
tstreble/athena:IPTag_clean into 22.0

InDetTrackSelectionTool was initialised in IPTag implementation but never used. The track selection instead relies on the existing Analysis::TrackSelector. The InDetTrackSelectionTool dependence is thus removed.

FYI @duperrin @thuffman

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