Move coverage.tgz and alignment.tar to be part of the per genome predictions

[wasade]

Currently, the coverage and alignment data are associated with the "Alignment profile" artifact, which contains a "none.biom" table. The features of the "none.biom" table are lineage strings, but the identifiers in coverage and the alignment data are the genome IDs. The feature table relevant to the coverage and alignment data are stored in a separate artifact "Per genome Predictions".

It would be helpful if the coverage and alignment data were to co-located with the corresponding feature table.