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 View Transforms on an image file with restrictive view policy.
2. See (Image will be Public) warning on Profile transform.
3. Click on Workcard transform.
4. Go back to View Transforms page and visit the Workcard transformed file.
5. Check if its view policy matches the original file.

Reviewers: O1 Blessed Committers, speck

Reviewed By: O1 Blessed Committers, speck

Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15663

Differential Revision: https://we.phorge.it/D25462

Signed-off-by: Zero King <l2dy@icloud.com>