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

syreclabs/go-tools,argandas/tools,syreclabs/go-tools,springning/tools,runcom/tools,josharian/tools,sshetty10/tools,argandas/tools,sshetty10/tools,golang/tools,maddyonline/tools,cw2018/tools,glasser/golang-tools,jdhenke/tools,cmars/tools,nicot/tools,syreclabs/go-tools,matryer/tools,jdhenke/tools,jdhenke/tools,4ad/tools,glasser/golang-tools,dmitris/tools,sshetty10/tools,josharian/tools,springning/tools,cmars/tools,cw2018/tools,4ad/tools,magiccao/tools,4ad/tools,golang/tools,matryer/tools,nicot/tools,maddyonline/tools,glasser/golang-tools,runcom/tools,matryer/tools,cmars/tools,nicot/tools,cmars/tools,sshetty10/tools,josharian/tools,golang/tools,golang/tools,dmitris/tools,maddyonline/tools,dmitris/tools,magiccao/tools,springning/tools,josharian/tools,glasser/golang-tools,argandas/tools,dmitris/tools,syreclabs/go-tools,matryer/tools,maddyonline/tools,cw2018/tools,magiccao/tools,springning/tools,magiccao/tools,runcom/tools,argandas/tools,jdhenke/tools,runcom/tools,syreclabs/go-tools,golang/tools,syreclabs/go-tools,cw2018/tools,nicot/tools