Add output to jet builder algorithm
This fixes the last failing test in the Stripping part of run2-patches: https://lhcb-nightlies.web.cern.ch/nightly/lhcb-run2-patches/1421/Stripping/x86_64_v2-centos7-gcc12-opt/tests#StrippingSelections_test_input_output_locations
The issue is that the FilterDesktop algorithm takes as input the location of the previous HltJetBuilder one. The HltJetBuilder saves its particles to the standard location based on its name - however the test fails if there is an algorithm with an input that is not defined as an output from somewhere else.
This seems like a bit of a hack to me but harmless. Unfortunately the people who implemented this have long since left the collaboration.