Add job segments to workflows, and step segments to jobs

To better visualize where a workflow, or job, is spending most of its time, and which jobs/steps are happening in parallel, it would be nice to see duration sized segments, like this:

<img width="750" height="813" alt="Image" src="https://github.com/user-attachments/assets/d6506ee8-d581-4946-9866-9d415c68b30f" />