Provide workflow to harvest only regular metadata from OJS and then add geospatial metadata manually

[nuest]

• Re-use JavaScript code from OPTIMETA geoportal for UI > https://github.com/TIBHannover/optimetaGeo/blob/main/js/submissionMetadataFormFields.js
• Workflow (might need an needs an extra UI)
  • Provide a list of OJS instances (enter in a big text field, one per line)
  • Give the collection a name and store in collection_name (simple text field)
  • Click a "Harvest" Button > harvesting job is started
  • Harvest regular metadata and mark the publications in the database (mark as demo_collection: true and with collection_name and user)
  • When the harvesting job is completed the user who started it gets an email
  • The logged in user can open a new page where all harvested records are shown in a scrollable table
  • When clicking a record the UI for inserting the temporal and spatial metadata appears with a "Save" button

Alternatively a shortcut: enhance the existing harvesting workflow to not fail when geometadata is missing and to tag items from a specific harvesting run. Use some other online platform to draw the corresponding geometry and copy over the GeoJSON manually.

[nuest]

With https://github.com/nuest/optimetaPortal/commit/536d80beb6079c71bfca70d51877b2408f21f323 the manual adding of location data should just work!

[nuest]

This workflow could profit from a "drop data" or "drop link to data repository" feature that uses geoextent-as-a-Service via an API.