workflows: submission update

* Amends the literature submission to start a new workflow
  asynchronously to perform post-processing, such as enabling
  approvals in Holding Pen.

* Adds new tasks used in the workflows of submissions.

* Adds a new module for robotupload utility functions used by
  the new tasks.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>