Migrate production "static" worker to "elastic" workers

wip (feel free to amend) [3]

Blockers:

• logs pushed to elasticsearch
• Recycle 3 ip public addresss from static workers to give to rancher-metal0[1-3] (not a blocker so far)

Ideal but not blocking:

• Alerting (if something is not running properly [1])
• #4819 (closed): Priority on services (for kube scheduler in case of pressure) - charts ready but not yet activated on production pods.

Regarding the charts, everything already exists since it's eployed in staging already.

Plan:

• Migrate listers
  • possible special case for github lister [2]
• Migrate loaders
  • high concurrency for git
• Migrate indexers (running on azure today) (we'll keep them running there for now)
• Migrate deposit checker
• Decommission worker nodes
• swh/infra/puppet/puppet-swh-site!644 (merged): swh-site: Update manifest to decommission the nodes too.

[1] Something already exists but it's not widely deployed

[2] Nothing might be required though. We can declare that lister as a standalone one (to double check). Currently, it's running in a dedicated vm to avoid starvation on the other listers.

[3] https://hedgedoc.softwareheritage.org/4ZHT03kRT7mHYOEm1MSueQ#Points-to-solve-before-going-to-production