R1:10a3f4fa192d

Use predictable filenames when downloading raw diffs from a revision

Summary:
To prevent spammers from abusing this feature on a public server, do not include query parameters in the generated filenames. See <https://github.com/mozilla-conduit/phabricator/commit/d8bb7d91b7d219902afed1ae7a8ae5e33862a842>.

Ref T15665.

Test Plan: Download raw diff from a revision and check filename in URL.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

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