Remove QtBase_containers_Integration from CI configs.

There has not been commits to qtbase#containers and
the branch is already merged to stable.

Change-Id: Ia7e093753b11322771e7f2907b39f196387b26ae
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Simo Fält <simo.falt@digia.com>