Exclude some test data from being linted.

Summary: Currently, `arc lint --apply-patches` will patch some files which contain test data, consequently causing unit tests to file. We should either modify the tests so that they can pass linting and unit tests successfully (if possible), or just exclude them from being linted.

Test Plan: Ran `arc lint --apply-patches` and ensured that these files were not patched.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9437