migrate sd-exporter to kubernetes

It currently runs on: sd-exporter-01-inf-ops

It's cpu/memory saturated on occasions. There are issues with it: https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/10936 . It's running on a legacy OS (Ubuntu 16.04).

Moving to k8s should help with updates of the exporter, updates of the underlying OS, observability of the exporter, ease of maintenance.

We will be migrating sd-exporter in the following environments

sd-exporter-01-inf-gstg.c.gitlab-staging-1.internal
sd-exporter-01-inf-ops.c.gitlab-ops.internal
sd-exporter-01-inf-gprd.c.gitlab-production.internal
sd-exporter-01-inf-db-benchmarking.c.gitlab-db-benchmarking.internal
sd-exporter-01-inf-pre.c.gitlab-pre.internal

Getting inspiration from previous similar deployment, I am going to evaluate if we can use the same plan:

• Create an SD Exporter helm chart 👉 charts!361 (merged)
• Create stack-driver secrets 👉 https://ops.gitlab.net/gitlab-com/gl-infra/config-mgmt/-/merge_requests/8043
• Create a deployment for the gstg cluster 👉 gitlab-com/gl-infra/k8s-workloads/gitlab-helmfiles!4660 (merged)
• Create a deployment for the db-lab, ops,pre cluster
• Create a deployment for the gprd cluster