Add latency to `SucceededJobDto`

The `SucceededJobDto` class contains the `TotalDuration`, which seems also to include the latency.

It would be useful to be able to distinguish between the execution time and latency, for instance in cases where you want to assess the execution speed of the job.

Could the latency be added to `SucceededJobDto`?

Also, it might be useful to add duration and latency to the `FailedJobDto` class.

Start by locating the SucceededJobDto and FailedJobDto classes and tracing how TotalDuration is populated. Determine how execution time and latency should be distinguished for successful and failed jobs, then verify that the DTOs expose the requested values consistently.

Written by the indexing model from the issue text.