R1:005fea5a14f4

Fix view policy inheritance on image transforms

Summary:
Inherit viewPolicy from original image in image transforms and warn about Profile transform making transformed images public. Details:

https://hackerone.com/reports/1984060

https://github.com/mozilla-conduit/phabricator/commit/8358b435a99435a95e0dffbbb92f71dc1961bc7b

Closes T15663

Test Plan:
1. Click {nav View Transforms} on an image file with restrictive view policy.
2. See (Image will be Public) warning on Profile transform.
3. Click on…