Add to lookup service restrictions on concurrent sessions for a user.

[GrahamDumpleton]

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

The training portal allows for a limit to be placed on the number of concurrent workshop sessions a user can run across all workshops hosted on a specific training portal. This is enforced separately for each training portal, meaning that if there are multiple training portals running on one cluster, or distributed across multiple clusters, they could create workshop sessions on each training portal, as there is no global cap.

Describe the solution you'd like

Add the ability to enforce a global restriction on number of concurrent workshop sessions for a user at the tenant level in the lookup service. This would provide a road block for a single user trying to use Educates as a resource server for running stuff such as bitcoin miners.

Describe alternatives you've considered

No response

Additional information

No response