Add in edit times for New Discussions into SpeedGrader

[KeriSalyards]

Edit times on discussion posts no longer appear in Speedgrader when using the new discussions design. The edit times are still visible in the discussion itself, but it's EXTREMELY tedious to flip back and forth when you're trying to grade. This is extremely helpful for instructors, especially if they are looking for student growth and reflection. The post edit times were there for the old discussion design, so I'm hoping this was just an oversight and can be fixed quickly!

[vanzandt]

This is an incredibly helpful insight. I fully support this request. I would hope that they can address this so that Discussions Redesign is brought to parity before the enforcement date.