staging gitlab needs yaml size configured

[scottwittenburg]

This job failed because the yaml was too big, we just need the size updater applied to staging.

[scottwittenburg]

Oh hum, it seems we already have one: https://github.com/spack/spack-infrastructure/blob/main/k8s/staging/custom/gitlab-setting-updater/kustomization.yaml

So either it's not working, or the limit needs to be raised again (raised recently in #615).