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Add missing extra namespaces from prod config to labs version

Description

Add missing extra namespaces from prod config to labs version

These used to be inherited, so there are orphaned pages that
cause problems.

Do this in CommonSettings-labs.php so we can append to prod
settings.

Bug: T111267
Change-Id: I8f4c0923d45c5e97c13f085636205a8ede3d9060