Add "check workflow" step to Jira workflow manager #62
Description
The Jira workflow manager, located in t5common, currently only has two steps: a workflow step and a publish step.
An intermediate step should be added to support non-blocking workflow steps.
With this addition, we can probably remove the mark-job command and rely on exit status from the individual steps to determine success. This would avoid the requirement for workflow implementers to add a t5common dependency to any workflow or publishing code.