chore(observability): Update ingress dashboard to use traefik-specific telemetry
Fixes gitlab-org/opstrace/opstrace#2409 (closed)
Test snapshot available at: https://dashboards.gitlab.net/dashboard/snapshot/QxbPLDDcLdEjRHW6QXiHJA5DwW17rAru?orgId=1
Edited by Ankit Bhatnagar