11054 on2 delete

Works around the `O(N^2)` performance issue of trying to delete all the files in a fileset for each of the images in a file, This is typically only perceptible when deleting plates when N is roughly `10^3`.

**Note:** the scope of this PR has been extended to include gh-1223 and in general all the current instabilities in server-side chgrp/delete related to MIFs. There are a number of experiments in terms of the `ome.services.graphs` (internal) API that have been reverted, and several locations which will need further cleaning up.

**Limitations:** (include but not limited to)
 * All chgrp and/or delete operations must be performed in a `DoAll`
 * `FilesetVersionInfo` will be lost on `chgrp`