R1:47b14c9bdecf

Convert inline profile image transforms to new transformations

Summary:
Ref T7707. Fixes T7879. Fixes T4406. When creating profile images:

- Use the new transforms;
- mark them as "profile" images so they're forced to the most-open policies.

Test Plan:
- Set restrictive default file policies.
- Changed profile picture, project pictures, etc. Verified they were visible to logged-out users.
- Registered via OAuth.
- Updated a Conpherence thread image.
- Browsed around looking for profile…