Release prep v6.0.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit cfbceb54d05f6c79e99c8300f2272d56b1effd52. Please verify before merging:

• [ ] last nightly run is green
• [ ] Changelog is readable and has no unlabeled pull requests
• [ ] Ensure the changelog version and metadata version match

[CLAassistant]

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