Enable cost allocation tags on openscapes AWS account

[yuvipanda]

Once #4464, #4485 and #4482 are done, we need to 'enable' using the various tags we have set up as a 'cost allocation tag'.

This will need to be done via terraform: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ce_cost_allocation_tag.

The following tags would need to be 'activated':

• 2i2c:hub-name
• 2i2c:node-purpose
• aws:eks:cluster-name (autogenerated by AWS)
• kubernetes.io/created-for/pvc/name (allows us to track cost of hub db PVC and prometheus PVC)
• kubernetes.io/created-for/pvc/namespace (same as above)
• kubernetes.io/cluster/openscapeshub (enables us to track disks used by PVCs)

Definition of done

Looking at https://us-east-1.console.aws.amazon.com/billing/home#/tags after logging into the openscapes account should show these tags being activated

[consideRatio]

Issue blocked blocked pending issue resolutions:

• Add tags to EFS filesystems on openscapes cluster #4464
• Move dask-gateway workers to their own nodegroups on the openscapes cluster #4485
• Move each hub to its own nodegroup on the openscapes cluster #4482

[consideRatio]

(This issue turned out to not be blocked by #4464)