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 Config → Temporary Tokens.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10603
Differential Revision: https://secure.phabricator.com/D15481