Rewrite of the zero/NaN padded telemetry to use

With the considerations of the previous changes, the zero padding of the traces has been removed and instead relative start and end times for the job traces have been introduced. This allows to reschedule and replay the full job, while using the recorded data for the time periods it was recorded.

If a job is rescheduled and has recorded telemetry, but the telemetry falls outside of the time-window, a utilization of 0 is used! This may be undesired and may require changes. See raps/engine.py:167

The changes need to be introduced into the non-frontier dataloaders.