Include orphans in manifest when filtering by only project/dataset

[nadove-ucsc]

This covers the "Service" section of #6529 (comment)

[hannes-ucsc]

For demo, filter by one of the MA datasets and the 1000G dataset. While signed in, perform a hand-over and show that a workspace table row exists for every row in every table in both snapshots, except datarepo_row_ids. Sign-out and repeat the hand-over with the same filters, and show that a workspace table row exists for every row in every table of the 1000G dataset.

[nadove-ucsc]

Demoed on anvildev. Demo again on anvilprod after promotion.