chore(ci): clean up greenhouse and related apps from github preview

[ArtieReus]

Summary

Clean up Greenhouse and related apps from the GitHub preview setup, as the new preview mechanism is already implemented and live.

Changes Made

• Removed github preview for greenhouse, supernova, heureka, doop and carbon.
• Cleanup the contributors package.json attribute since it is not anymore used as initially thought and not maintained.

Related Issues

• [EPIC](greenhouse): PR Previews - enable PR Previews with Unified Kubernetes Deployment (2) #1403

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings or errors.
• I have created a changeset for my changes.

PR Manifesto

Review the PR Manifesto for best practises.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8f2ed60

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

PR Preview Action v1.6.3
Preview removed because the pull request was closed.
2026-02-11 12:40 UTC