Code Review in progess should be indicated on a commit

[damccull]

Describe the improvement that you'd like Right now, you can start a code review and it even persists across VSCode sessions. But there's no marker on the graph to show which commit you've started a code review on. If I close out for 2 days over the weekend and come back to a graph with no indications, I have to click around to find it.

Please add an icon or some other indication on each commit with an open code review.