workflows: blueprint code update

• Moves some functions away from Holding Pen blueprint to utils (pending future separation from workflows into a new holding pen module).

• Optimizes some error-prone code to get the workflow definitions when trying to fetch formatted data from the object.

• Removes lots of unused/old code.

• Performs some PEP8/257 updates.

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