Adding softbtag veterx container to SUSY2 Derivation

Sonia Carrarequested to merge
scarra/athena:SoftBtagSUSY2DAOD into 21.2

Merge request to add the sotf b-tag vertex container to SUSY2 derivation. The request was discussed here: https://its.cern.ch/jira/browse/ATLSUSYDPD-1954 Tagging @jdandoy and @toyamaza

Edited by Sonia Carra

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