Prioritize Solr Thumbnail Field URIs (GeoBlacklight Sidecar Images)

[srappel]

See: https://github.com/geoblacklight/geoblacklight_sidecar_images?tab=readme-ov-file#prioritize-solr-thumbnail-field-uris

We should try to find a way to harvest the thumbnail embedded in the ArcGIS metadata and put it somewhere on the Apache server.