WIP:Fix nightly instantiation tests

Fix failing nightly test: https://lhcb-nightlies.cern.ch/logs/tests/nightly/lhcb-gaudi-head/1621/x86_64-slc6-gcc62-opt/Stripping/#StrippingArchive.instantiate-all-strip

Also, for better modularity and parallelization, split the tests inside instantiate-all-strip into individual campaign.

Targeting master branch, but this can be back-port to current campaigns if needed.