Proper error handling and reporting to the API for the worker

[greenw0lf]

The solution we have right now for reporting is hacky, and the error handling doesn't handle all (or at least most) cases. I want to have an in-depth look at the code and see how to better report and handle all kinds of errors

[greenw0lf]

Implemented this properly in the audio extraction repo: https://github.com/beeldengeluid/audio-extraction-worker

Follow the same example, but after I am done with the audio extraction work, so that no effort is put on code that will be removed from this worker (transcoding).