Show downstream pipeline jobs in the downstream pipeline dropdown

Problem

Currently we only show the jobs inside stages of the main pipeline in the mini pipeline graph. The downstream pipeline buttons lead directly to the downstream pipeline page and don't allow you to see the stages or jobs inside that pipeline.

Also, it's difficult to differentiate between the stages and the downstream pipelines in the mini pipeline graph.

Proposal

• Show the downstream pipeline jobs in a dropdown when clicking on a downstream pipeline
• Show the stage name for stages and the downstream pipeline name or # in the dropdown header.

Related comment from Sarah:

Yes, it would be possible to add the jobs or stages here. I would recommend breaking that into a followup, because the engineer will need to be sure they are loaded async (so there are not performance problems) and so it would be a bit complex, but it's definitely doable.