Check that metadata entities are corretcly displayed

Related to #780 (closed).

An entity on a metadata should be displayed in the metas list (duh) with a link toward the entity details.

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assigned to @erwanrouchet

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Entities on metadata are currently only displayed in the All entities pane because the backend is not returning them!

https://gitlab.com/arkindex/backend/-/blob/65247cabf6513ce9d526487f281b56e187bdc602/arkindex/documents/api/elements.py#L1283

They are not included in the metadata_count either: https://gitlab.com/arkindex/backend/-/blob/65247cabf6513ce9d526487f281b56e187bdc602/arkindex/documents/api/elements.py#L818

The frontend does not support displaying entities on metadata in the metadata panel, but that should not be hard to do. I am not sure if the metadata should be editable in this way or not, or if we should show the name and value along with the entity or just show the entity's name…

mentioned in merge request !1067 (merged)

mentioned in commit 480f9263

closed