Fixes T9430. Fixes T9362. This changes the default view of Audit to work like Differential, where commits you need to audit or respond to are shown in buckets.
This is a bit messy and probably needs some followups. This stuff has changed from a compatibility viewpoint:
- The query works differently now (but in a better, modern way), so existing saved queries will need to be updated.
- I've removed the counters from the home page instead of updating them, since they're going to get wiped out by ProfileMenu soon anyway.
- When bucketed queries return too many results (more than 1,000) we now show a warning about it. This isn't greaaaat but it seems good enough for now.