R1:82be07315cbf

Improve rendering of tokenizer tokens in Herald when editing rules

Summary:
Fixes T7848. @jasonfsmitty discussed an issue in great detail there and in D14359, and I completely missed it. Specifically:

- If you save a "Change status to: Open" rule in Maniphest, and then edit it again, the token shows "Unknown Object (???)" instead of the correct token.
- That's because loadHandles() has no idea what to do with the value "open", since it's not a real PHID.

The way we render tokenizer tokens in Herald…