tasks: Remove unnamed arguments use and restore visit_date parsing
Using unnamed arguments is unsafe with celery tasks and parsing visit_date is still required in case that parameter is used.
Migrated from D7698 (view on Phabricator)
Staging instance, all changes can be removed at any time
Using unnamed arguments is unsafe with celery tasks and parsing visit_date is still required in case that parameter is used.
Migrated from D7698 (view on Phabricator)