Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  218b6363ef86157f4e6103e3c87cb289fa4eaed1

Tag browser tests with @clean

This is to experiment with Jenkins job, on CI we will only run jobs
tagged explicitly with @clean.  I am tagging every single test to find
out whether they pass or fail, and hopefully have the failling to be
fixed.

bug: 58401
Change-Id: Ifb8437a2581f0d14fe4cd68d098c0d54828befa9