Support sprucing in ProdConf
Many thanks to @cburr :)
see also lhcb-datapkg/ProdConf!20 (merged)
Requirement to centrally run Sprucing jobs in the Nov. FEST, see https://gitlab.cern.ch/lhcb-dpa/project/-/issues/165.
cc @fibishop
Edited by Nicole Skidmore