add VRJetOverlapDecorator variables to VR track jet output in DerivationFramework

The VR track jets used for b-tagging boosted objects have an ill-defined b-tagging calibration for event topologies with overlapping track jets. The FTAG recommendations for VR track jets suggest to veto events "if any of your signal jets have relativeDeltaRToVRJet < 1.0." Currently, this variable is missing in the VR track jet output.

This MR schedules the VRJetOverlapDecorator](https://gitlab.cern.ch/atlas/athena/-/tree/21.2/PhysicsAnalysis/JetTagging/FlavorTagDiscriminants#hbb-tagging) as a jet modifier when adding VR track jets to a derivation output and add its output to the list of VR track jet variables to be written out.