R1:a8271ecd4010

Remove most callsites to Controller->renderHandlesForPHIDs()

Summary: Ref T7689. This moves most of the easy/testable callsites off `Controller->renderHandlesForPHIDs()`.

Test Plan:
- Viewed a file; viewed author; viewed "attached" tab.
- Viewed a mock; viewed attached tasks.
- Viewed a credential; viewed "Used By".
- Viewed a paste; viewed author; viewed forks; viewed forked from.
- Viewed a dashboard; viewed panel list.
- Viewed a dashboard panel; viewed "Appears On".
- Viewed a Phortune account…