Rename Workflow Manager to Listaflow

This MR updates the README and code to reflect the Workflow Manager's new name: Listaflow!

JIRA tickets: https://tasks.opencraft.com/browse/STAR-2465

Discussions: https://forum.opencraft.com/t/name-ideas-for-the-workflow-manager/1263

Author notes and concerns:

I have not changed the historical discoveries to say Listaflow because I felt these should be preserved as they were for posterity. Let me know if there's anything you think I should do here.