Migrate note fields of content_items and content_item_definitions to use...
Migrate note fields of content_items and content_item_definitions to use default_value instead of option.text value. Add default_value to dossier_item_definitions and use it to store note text instead of option.text value. Refactor frontend and backend to edit default_values of content_items, content_item_definitions and dossier_item_definitions.