Please show workspace instances and attributions in the admin panel

[jankeromnes]

Is your feature request related to a problem? Please describe

A frequent use case that comes up when helping customers is knowing: what instances ran for a given workspace, and how long did they last.

For example, in the context of #15304 it's helpful to know that, for a given workspace, there were 5 instances, but 2 instances ran for 24h straight (i.e. the customer was affected by the timeout bug twice, which tells us how many credits they should get back).

Describe the behaviour you'd like

In the Workspace page of the Admin panel, please show a list of:

• Instance ID
• When started/stopped
• Duration or credits spent
• Usage attribution (e.g. link to org or user)

Describe alternatives you've considered

For now, we tend to go spelunking into the DB in order to piece together this information manually. But, this requires in-depth knowledge of the DB and significant time & manual effort.

Additional context

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.