Drop conflicting VertexAuxContainer output in BPH4 derivations
Follow up to !66916 (merged)
Fix BPH4 ART test failure https://bigpanda.cern.ch/art/jobs/?package=DerivationFrameworkBPhysART&branch=main/Athena/x86_64-centos7-gcc11-opt&ntag_full=2023-11-12T2101