Release prep v4.0.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit d78791329fd27e9cd544b1de259e0c9dbf9efc27. Please verify before merging:

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