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Merge Arcanist lint changes from "experimental" branch

Description

Merge Arcanist lint changes from "experimental" branch

Summary: Ref T13395. Collapse changes to the linter workflow from "experimental" into "master".

Test Plan: Ran arc lint. Noted flag changes in changelog.

Maniphest Tasks: T13395

Differential Revision: https://secure.phabricator.com/D20986