Add registry app details dashboard for Redis
Related to gitlab-org/container-registry#758 (closed). This MR adds a new detail dashboard for the Container Registry to visualize the Redis application-side metrics related.
Note that the connection pool saturation charts will remain broken until gitlab-org/container-registry!1116 (merged) is released (will happen this week).
Related to gitlab-org/container-registry#758 (closed).
Edited by João Pereira
