make tests that care _less likely_ to clobber each other through streamcorpus_pipeline.config.static_stages pollution
make tests that care _less likely_ to clobber each other through streamcorpus_pipeline.config.static_stages pollution

trec-kba/streamcorpus-pipeline,trec-kba/streamcorpus-pipeline,trec-kba/streamcorpus-pipeline