fix: Amend relation to python dictionaries approach as using polars (…#25

stevenhsd merged 2 commits intodevelop_v05NHSDigital/data-validation-engine:develop_v05from

bug/ndit-761_ensure_date_type_persisted_in_feedback_messageNHSDigital/data-validation-engine:bug/ndit-761_ensure_date_type_persisted_in_feedback_messageCopy head branch name to clipboard