Make migrated archived items more metabasey

[dpsutton]

Items that are migrated feel a bit hard to use. In the previous version, there was some mysterious action at hand, but it would still unarchive a tree.

OurAnalytics
└── A
    └── B
        └── C
            └── card

Example suppose collections A > B > C and in C is a card. In the archive, each of these would appear as top level in the archive, but if you unarchived B, it would unarchive C and card.

In the trash, you cannot unarchive B. If you move B, it will only move that collection and not any of it's children. Also, if you were to restore A, it would not restore any of its children.

This feels a bit more understandable. Certainly the old way was quite wild in honoring the hierarchy without showing it, i'm just worried it might be a bit too tedious.