Add support for VR jets in JetClusterer
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The new jet configuration (Release 22, AthenaMT) does not support VR jet building. In order to implement VR jets, changes were made to JetClusterer and JetRecConfig . Since VR JetDefinition requires mass scale and minimum jet radius, some changes in the JetDefinition class were necessary. In order to support (VR) track jets, which are built from primary vertex tracks, changes were made to JetInputConfig and StandardJetConstits. Finally, to test the changes, custom VR JetDefinition was added to StandardSmallRJets; this JetDefinition in turn is used by test_StandardJets.