feat: Add kubecost to Kubernetes addon

[florentio]

What does this PR do?

Closes #894

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs required examples and docs except a new pattern or add-on added.

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[bryantbiggs]

Great addition, thank you! Lets again add this to an existing example - lets add this to the eks-cluster-with-new-vpc and the karpenter examples. We also need to enable the EBS CSI driver since we now default to EKS 1.23 so you'll need to ensure those examples have enable_amazon_eks_aws_ebs_csi_driver = true as well. Again, thank you for the contribution 🎉

[bryantbiggs]

Thank you for the contribution @florentio !