Implement ChangeDetailsCard

[stuartrowe]

Prototype for a ChangeDetailsCard on the pipeline overview graph.

Fixes #375

Testing done

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6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[timja]

I think this needs some sort of cap:

(that's a truncated screenshot showing a lot of changes)

Jenkins core handles it by showing less detail:

[stuartrowe]

Absolutely. I think the cards need to support collapsing too. I will attempt that in a separate PR.

[mr-remington]

@stuartrowe any updates? I was getting ready to work on the same view though I had a different approach. For us the pipeline card is too small(massive parallel pipeline) so I was gonna tweak it so that the Details card would be positioned on top of pipeline and give the pipeline card full width. This would directly interfere with your work here

[stuartrowe]

I haven't had a chance to revisit. Don't worry about interfering with this prototype if you want to explore your proposal.