R1:772c658aac41

Convert one-time file access tokens to modular token types

Summary: Fixes T10603. This is the last of the ad-hoc temporary tokens.

Test Plan:
- Used a file token.
- Viewed type in {nav Config > Temporary Tokens}.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10603

Differential Revision: https://secure.phabricator.com/D15481