This ticket follows on
DM-15150 to create a command line interface for the nbreport client application.
The CLI is designed in https://sqr-023.lsst.io/v/DM-15003
Specifically, this ticket will create the nbreport test test CLI. This command demonstrates most of the notebook-related workflow without involving GitHub or the api.lsst.codes/nbreport service. It will
- Create a test report instance from a report repository
- Render the notebook from the template
- Execute the notebook