Upload page bugs

The new upload page is functional, but need lots of refinement.

Here are some small issues with the new Upload page that I ran into when trying to ingest new data to test the materials index/API:

• The entries have with_embargo=True, even if one selects "No embargo" during the upload process
• Call stack overflow in the GUI when trying to open the page for an individual already processed Upload (at fairdi/nomad/latest/gui/uploads/<upload_id>)
• When starting a new Upload, there are some API requests resulting in 400 Bad Request. Looks like the page is trying to access the raw files of the upload, even though nothing has been uploaded yet.

Other issues:

• use new refactored Datatable for entries
• report last processing message instead of obsolete "processing steps" (#576 (closed))

More features:

• a reprocess button on the UploadPage.js. Could be placed by the user, delete button on the top right
• a reload button on the UploadsPage.js as a table action button on the table of uploads.