Show additional metadata in duplicates lists

[floriangantner]

Is your feature request related to a problem? Please describe.
The duplicate detection has some configurable list of metadata to shown on matches during the import from external sources.

dspace-angular/src/config/default-app-config.ts

Line 255 in 4812f18

// NOTE: list of additional item metadata to show for duplicate match presentation list

These are passed through the listelement showing the duplicate.
https://github.com/4Science/dspace-angular/blob/4812f189b1bbdcfd890f45317635eb2f1e0bdb8d/src/app/shared/object-list/my-dspace-result-list-element/item-list-preview/item-list-preview.component.ts#L47C12-L47C24

, but the value is never read and it is not shown in the duplicates-list during import.

Describe the solution you'd like
We would like to show the values which determine the duplicate so some user can better reason why it is some duplicate.

The list of metadata could also be filtered by all matching metadatafields from the external source.

Describe alternatives or workarounds you've considered

Additional context

• new duplicate list during import on DSpace-Cris 2023.02.00. before it was in the submission process