workflows: Holding Pen cache update

• Changes usage of Redis to use invenio.ext.cache to conform with cache usage elsewhere in Invenio.

• Removes duplicate code and restructures code with focus on clean code.

• Adds a new get_workflow_name() function to BibWorkflowObject.

• Changes the all variable to a tuple.

• Updates bundles to remove unused and duplicate JS.

• Adds missing dataTables import in main table template.

• Simplifies the tags session handling.

• Fixes BibWorkflowObject.add_task_results calls outside workflows.

Reported-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>