Store information about parent task for every related workflow
Update header of 'Workflow Details' page - show information about parent task if it exists
Update headers of 'Task Details' and 'Task Edit' pages:
- show link to parent task if it exists
- show link to workflow details for both pages
- merge 'links' and 'actions' sections in header for more consistent view
- show 'Edit' button on the top of the page