Registry: readiness/liveness missing for the deployment

Summary

We are currently missing a readiness/liveness check for the registry deployment https://gitlab.com/gitlab-org/charts/gitlab/blob/aca56552ec5ee3d2763bc6d2b7c6eab6f228092d/charts/registry/templates/deployment.yaml, this means that for deployments we will see a fairly large error spike because the rolling update strategy will run through the pods very quickly.

See https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/7780