Produce a usage report for a single gitpod team and validate

[easyCZ]

To remain lean and iterative, we want to first produce a usage report for a single team (gitpod) and validate the usage report before writing any data into stripe or a database.

Using the DB models from #10317, pull data from the DB to produce an initial version of the usage report.
In this task, we'll need to iterate a bit to get the necessary logic steps correct. As a result we should have a usage report (for Workspaces) for team gitpod for a given month.
Validate the report from a human perspective against existing data.