workflows: task result templates
- Amends task result rendering in Holding Pen to use templates under the folder templates/workflows/results.
- Fixes a problem in refextract task.
- Adds refextract template.
- Adds template for fulltext_download task to display a nicer looking fulltext icon to users.
- Amends tests to accommodate this new change.
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>