Looper does not populate environment variables for certain items in the pipestat config

[donaldcampbelljr]

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This works:

pep_config: metadata/pep_config.yaml
output_dir: ${RESULTS}
pipeline_interfaces:
  - pipeline/pipeline_interface.yaml
pipestat:
  pephub_path: donaldcampbelljr/human_seqcol_digests:default

This does not work:

pep_config: metadata/pep_config.yaml
output_dir: ${RESULTS}
pipeline_interfaces:
  - pipeline/pipeline_interface.yaml
pipestat:
  pephub_path: ${PEPHUB_PATH}