workflows: holdingpen updates

* Adds link to arXiv for arXiv identifiers.

* Shows only INSPIRE categories.

* Change the type of process_record_arxiv workflow
  from 'record' to 'Harvested record' to be distinguished
  from submitted records.

* Adds the type 'Submitted record' to literature and
  literature_simple workflows.

* Adds task halt_to_render to literature_simple workflow
  in order to update the title and description columns in holdingpen
  maintable.

Why is this actually needed to show the title and description? The record should be visible anyway by the time upload_record_sip is run or?