workflows: task result templates

Adds templated task results for use in Holding Pen.

Before:
![Image]
(https://www.dropbox.com/s/0sryglpxpesfnh9/Selection_002.png?dl=1)
After:
![Image]
(https://www.dropbox.com/s/pfgo4fl8kltgv78/Selection_001.png?dl=1)

Also adds better documentation and other fixes.
163: D290 White spaces around docstring should be trimmed.
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879: D290 White spaces around docstring should be trimmed.