The "Get all ORT runs for a repository" endpoint needs more data and sorting options

[Etsija]

The API query for getting all ORT runs for a repository is currently sortable by the index and created_at columns only. We have a UI view which also shows the Run Status and Duration for the runs:

Implementing client-side sorting for the table would be far too inefficient and lead to slow performance, so we would need the API endpoint to:

• also be sortable by status field
• calculate and return the duration of the run, and make that sortable. First implementation could be to just return the duration, be it for an ongoing or finished job, but that's debatable

Moreover, we use the same endpoint for this view:

For this table to be made sortable, we would need the endpoint to also

• return total number of runs for the repository
• last run status, and job statuses for it
• timestamp of last run
• be able to sort with: total number of runs, last run status, and timestamp of the last run