Hierarchical display collection dataset states

[mvdbeek]

Should eventually address #20720 and all the other related issues.
There's an extra join here, but it's probably worth it ?

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[mvdbeek]

Hmm, so this works but there's now another obvious issue that is harder to address in a performant way. The collection's update_time doesn't update with content updates, so the update query for the history panel doesn't pick up when the datasets inside the collection change state. And propagating that up is messy with potentially many datasets competing to update the collection ... and because the dataset has a recursive relationship with the top level HDCA this is not easy or performant to do either. It might be safer to turn this around and make the HDCA update_time a subquery