Cost Explorer API (9/n): adopt strategy for total costs

[consideRatio]

Definition of done

• Let aws-ce-grafana-backend acquire data for the daily total costs by filtering based on tags below, combined with logical OR.

  Based on a given cluster name, such as openscapeshub, the known 2i2c infra total can be calculated using the tag filter:

  • alpha.eksctl.io/cluster-name=<cluster-name>
  • kubernetes.io/cluster/<cluster-name>=owned
  • 2i2c.org/cluster-name (for openscapes this needs to be 2i2c:node-purpose=<any value> until k8s upgrades re-creates all nodes)
  • 2i2c:hub-name=<any value>

• The labels should be made configurable
• A manually defined grafana dashboard should be examplified to function against the backend. This should be panel 4 in [EPIC] Support attributing costs to individual hubs automatically on Openscapes #4453 (comment).