R1:77475736a34d

Switch Maniphest search indexing to real ApplicationTransactions

Summary:
Ref T2217. Move this off `LegacyQuery` and on to the real deal.

The rest of this patch mostly just replaces some gymnastics to get accurate-ish timestamps for CCs/Owners with `time()`. The search feature where edge time is stored was never really used and isn't necessarily of much value -- most indexers don't bother computing it exactly, and possibly we should get rid of it entirely. If it surfaces in the product again at some…