Add test to ensure case in drafting mode can't be marked as repsonded
Add test to ensure case in drafting mode can't be marked as repsonded

ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff