Revert "Hygiene: temp. skip of diff tests"
Revert "Hygiene: temp. skip of diff tests"

This reverts commit 51305c1368cf4b107e7a4e4a75c0ee8b8a1cef31.

(Let's have this sit around until it passes.)

Change-Id: Ifcc8783927b8b4765062aaa00a7c904a7856a52e

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps