Add Postgres exporter queries configuration file
The configuration file was taken from the production config at https://gitlab.com/gitlab-cookbooks/gitlab-prometheus/blob/master/files/default/postgres_exporter/queries.yaml
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The configuration file was taken from the production config at https://gitlab.com/gitlab-cookbooks/gitlab-prometheus/blob/master/files/default/postgres_exporter/queries.yaml