Test under-review English Wikipedia draft namespace on Labs

Production commit is Ib56f1085eea106de6767162e77614e36d2a505ca .
After behavior in Labs is tested, that can be deployed, removing the
Labs overrides.

Bug: 57569
Change-Id: I3520527afd48722d09f57dc959402184a5d59600
Merge "Test under-review English Wikipedia draft namespace on Labs"