Migrate save code now services to the elastic infra
As the elastic worker now have a proper sentry report routing happening. To avoid duplicating that effort, it's simpler to move the save code now worker to the elastic infra.
- swh-charts: Adapt new sentry configuration allowing proper error routing to sentry project
- swh-charts: Deploy new high priority worker in production
- swh-site: Decomission static high priority service
- swh-charts: Bump concurrency of high priority service as before (from 5 to 16)