Revert "[gitlab-ci] Allow wikigen pipeline to fail, so that it won't block the"

This reverts commit f052c8bc.

.gitlab-ci.yml

@@ -29,7 +29,6 @@ validate-data:
 wikigen:
   extends: .test-for-bullseye
   stage: validate
-  allow_failure: true
   parallel:
     matrix:
       - GENERATOR: [cpu_parameters, disk_reservation, environments, group_storage, hardware, kwollect_metrics, oar_properties, status]