Workflow names are sometimes out of date

[jbmorley]

The curernt architecture relies on a snapshot of the wokflow name, stored in WorkflowIdentifier if we're not in a position to perform a remote fetch to look up the current workflow name (currently in the Single Workflow widget configuration and in the grid when we have no results for a workflow). We should cache the current workflow names and provide convenience mechanisms to use these updated cached values if they exist.

This is related to the initial work done to ensure we always have something to display for the workflow name (#337, #131, and #375).