refactor: enable perl signatures in ImportConvert.pm (#7166)
refactor: enable perl signatures in ImportConvert.pm (#7166)

refactor: enable perl signatures in Import_Convert.pm

Replacing "shift" prototypes with perl signatures.
openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server