Members with no membership are 'Former member' on profile

Currently users that do not have a membership at all are marked as Former member on their profile. Perhaps it's more accurate to describe those as Unknown membership history, given that we are now able to distinguish actual 'former members' from e.g. 'former supporters' based on the existence of expired Membership objects.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information