chore(github-actions): change to upload to s3

[jeffchew]

This addresses https://github.com/carbon-design-system/carbon/issues/12177.

This PR adjusts the deploy script to build to a US geo object storage instead of Cloud Foundry.

COS environment variables have already been added to this repository.

[netlify[bot]]

❌ Deploy Preview for design-website failed.

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[ibmdotcom-bot]

Deploy preview created: https://ibm-design.github.io/design-website/deploy-previews/490/index.html

Built with commit: 568ee27af8ca5093f29b964846857c097d851900