dashboard/app: dedup changes in UI Currently for every benchmark/metric we show all changes for all builders x procs. With 4 builders and 5 procs, that's 20 changes (20 red/green boxes in a single cell). Instead show only maximum change for every benchmark/metric. This significantly reduces clutter in UI. When you click on the red/green box, you can see the rest of the changes.
dashboard/app: dedup changes in UI
Currently for every benchmark/metric we show all changes for all builders x procs.
With 4 builders and 5 procs, that's 20 changes (20 red/green boxes in a single cell).
Instead show only maximum change for every benchmark/metric.
This significantly reduces clutter in UI.
When you click on the red/green box, you can see the rest of the changes.

LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/126430043

proppy/build,proppy/build,evandbrown/build,proppy/build,evandbrown/build,golang/build,proppy/build,evandbrown/build,golang/build,golang/build,golang/build