Add support for aws.eks.node.type

[mackjmr]

Fixes #2017

Changes

Adds aws.eks.node.type with values fargate or ec2. Currently, cloud.platform = aws_eks exists, but there is no way to differentiate between a fargate or ec2 node.

Merge requirement checklist

• [x] CONTRIBUTING.md guidelines followed.
• [x] Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• [x] schema-next.yaml updated with changes to existing conventions.