ci: fix npm publish workflow and guard skip changeset usage

[mariobrgomes]

Summary

• allow the release workflow to push tags and PR updates after publishing
• keep the existing skip-changeset label but fail if it hides package-affecting changes

Testing

• not run (workflow-only change)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8c03c0c

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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