Add missing unzip dependency
Since deployment for gitlab-pages relies on the availability of unzip for extracting uploaded artifacts, the missing binary causes pages:deploy build jobs to fail as documented in gitlab-ce#28646
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Since deployment for gitlab-pages relies on the availability of unzip for extracting uploaded artifacts, the missing binary causes pages:deploy build jobs to fail as documented in gitlab-ce#28646