@VictorVerhaert, this is a blocking issue for the WorldCereal extractions. To summarize:

• In GFMapJobManager.on_job_done we looped over the asset index in the batch job metadata when downloading multiple assets from one job (which can be the case if sample_by_feature=True)
• This implicitly assumed that the index of an asset in the original FeatureCollection and the index of that same asset in the openEO job metadata was always the same --> dangerous! This can lead to the wrong naming of your asset file, which is the case in WorldCereal extractions right now
• I changed the loop to now iterate over asset_ids

I don't believe this is 100% backwards compatible as now the output_path_gen callable requires asset_id as a keyword argument. However, in light of the future deprecation of the GFMapJobManager and the fact that I don't see any other solution within the current API, I think this is justifiable.

In case you have another suggestion, please let me know!

closes #185