Add: "End Lease" by User

[pdoernin]

Is your feature request related to a problem? Please describe.

When a User tested enough and the Lease has still got time left, or the Lease was created without any timebox, the only way to end the session is via managers or admins.

Describe the feature you'd like

A function where users can give back their leases make it easier to administer the plattform and might make the solution more cost efficient for users.

[aws-khargita]

Thanks for opening this enhancement request. This would likely be an additional configuration flag on the lease template / global config to optionally allow this feature. I will bring it into our backlog for grooming and prioritization. Thanks!