Add env and stage selector to registry database dashboard

João Pereirarequested to merge
add-env-to-registry-db-dashboard into master

We were missing the environment and stage selectors for some of the graphs. We were using the namespace selector instead of environment but this is not consistent with the remaining dashboards.

https://dashboards.gitlab.net/dashboard/snapshot/hBUxaFVX7gmV9dOgJgucbamqitfwZ6rB?orgId=1&var-PROMETHEUS_DS=Global&var-environment=gstg&var-cluster=gstg-us-east1-c&var-stage=main&var-namespace=gitlab&var-Deployment=gitlab-registry

Related to https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/14304.

Edited by João Pereira

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