chore: don't cleanup ingest test outputs (non-CI) (#1680)
When running test-ingest test fixtures locally (but not in CI), keep
output .json's and other workdir artifacts around for the convenience of
debugging.
**Test Instructions**
Run
bash -x ./test_unstructured_ingest/test-ingest-azure.sh
and witness output .json's are visible. Yay! Now, to instead clean up
output .json's and workdir, run:
UNSTRUCTURED_CLEANUP_DEV_FIXTURES=1 bash -x
./test_unstructured_ingest/test-ingest-azure.sh
and witness the files have been cleaned up. Yay!
