Add functorcollection for vertex isolation

Follows Rec!3090

Functorcollection aiming at replacing the old tuple tool TupleToolVtxIsoln.cpp for the new FunTuple framework.

Fix on ParticleIsolation functorcollection to align the logic with ConeIsolation and VertexIsolation

Work towards completion of DPA task https://gitlab.cern.ch/lhcb-dpa/project/-/issues/178.

Edited by Tommaso Fulghesu

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