Clean up Node Affinity Labels for Self Hosted to not use meta

[lucasvaltl]

Is your feature request related to a problem? Please describe

Currently, we require the following node affinity labels for a cluster that runs Gitpod Self-Hosted:

• gitpod.io/workload_meta=true
• gitpod.io/workload_ide=true
• gitpod.io/workload_workspace_services=true
• gitpod.io/workload_workspace_regular=true
• gitpod.io/workload_workspace_headless=true
  --> we are still using the word meta here

Describe the behaviour you'd like

• Given that meta is a thing of the past, we should rename this label into server, or better group ide and meta into services.

Additional context

Internal discussion here.

[lucasvaltl]

Breaking change to every Gitpod installation out there - likely not worth the effort. Benefit - removes naming inconsistency. Drawback - everyone has to update Gitpod and their nodelabels. Won't do for now.