Check called workflows from caller workflows

[brettcurtis]

This is a handy tool - thanks! I see it being especially beneficial when you are a team who writes called workflows for other teams to consume. For example, in my repos for called workflows, I also run caller workflows for tests. I'd love to be able to have the monitor run and persist on the caller workflow test and check all the jobs in the called workflow. This would allow a sort of continuous monitoring over called workflows and change over time vs. adding or removing the monitor from the called workflow.