Link to the "root" CI pipeline in the commit view in the case of triggered pipelines, not the latest pipeline

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As described in gitlab-ce#22972 a way to get multiple pipelines in a project is to use triggers within the CI itself to start "sub-pipelines".

This screenshot shows the resulting commit view. Top-left is a link to the latest pipeline, whereas the window on the right shows the "root" pipeline:

Instead of showing the latest pipeline ID with everything else hidden under the Pipelines tab the commit view should check:

1. Are there more than one pipeline?
2. If so, does the child/parent relationship lead back to the oldest ID?

And then show e.g.:

Pipeline <root pipeline ID> passed with stages XY in <time>: N other triggered pipelines are [finished|still running]

Or maybe show some mini truncated version of the graph UI shown on the root pipeline itself.