ImportTaskFactory - set success/fail on objects

At the moment if a ManualVariantEntryCollection fails - it doesn’t set the objects status to ERROR - even though the upload pipeline fails, so you'd never know on the watch/polling page.

We have ```ImportTaskFactory.get_data_classes```

We should either just set import status on those objects, or perhaps have a callback where you can do the setting. For instance we have a hack for VCF/sample to do this via ```set_vcf_and_samples_import_status``` but could make it more general