Disable ArticleMetadataTest

It is not supposed to be run anywhere else than on a developer's machine
pre-populated with test data and as such not suitable for running by Jenkins.
Fixing this would amount to a rewrite.

Bug: 67615

Change-Id: I1dbe5c2d5601a17f41b217f9da69dfc807a35a2b
Merge "Disable ArticleMetadataTest"