R1:8a98868bfbc4

Remove "days fresh" / "days stale" indictator in Differential revision list

Summary:
Ref T10939. I'm not //totally// opposed to the existence of this element, but I think it's the kind of thing that would never make it upstream today. I think this should just be a T418 custom sort of thing in the long run, not a mainline upstream feature.

Overall, I think this thing is nearly useless and just adds visual clutter. My dashboard is about 100% red. This also sort of teaches users that it's fine to let…