scripts: improve update_packager_codes.pl error handling
scripts: improve update_packager_codes.pl error handling

Report errors using the `auto_diag` parameter and don't discard the
rest of the file when an erroneous line is encountered.

openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server