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)

[1] swh/infra/puppet/puppet-swh-site!617 (merged)