refactor: remove canonicalize_saint (#6953)
refactor: remove canonicalize_saint (#6953)

This function doesn't seem to be used, it doesn't get called nor does
it call other functions.

Co-authored-by: Stéphane Gigandet <36bd4f73be32ed7262c164e7ee72163e7543989e@openfoodfacts.org>
openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server