Clean up all artifacts on a subsequent run which have been created by a crashed compile run

[romeokienzler]

e.g. AssertionError: File s1generate_stac_item.py already exist. Cannot convert notebook. when creating a grid-wrapper:

c3_create_gridwrapper -b s3kv_grid_wrapper -r us.icr.io/geodn -l DEBUG s1generate_stac_item.ipynb