Feature request: Dashboard - view the last used date of SSH keys

[stqp]

Motivation

• We want to periodically delete unnecessary access keys for amazee.io, so I'd like to be able to check the last used date of SSH keys.

ASIS

• In amazee.io, it's not possible to see the last used date of SSH keys.
• 

TOBE

• Like GitHub, we want to see the last used date of tokens.
• 

[shreddedbacon]

I've transferred this to the UI repository as this information is available in the API. It just needs to be exposed in the UI.

Edit: lastUsed is available on the type SshKey which is used in the UI to display the keys.