Add last subscription usage date to the member list in DockerHub

[michael-buchner]

Please add the last subscription usage date to the member list in the DockerHub. Would be very helpful as an org owner to see how the subscriptions are being used.

[hpruud]

This functionality would help license admins to see whether an assigned license is actively in use or not and would make license administration a less time consuming effort. Now the license administrators have to manually check with each user who has a license to know if the license is in use or not.

Please prioritize this task!