Clean publish temp files after upload

[ricardo-devis-agullo]

Summary

• Track the uploaded package tarball and extracted temp directory during registry publish
• Remove only the current upload's tarball and extracted directory after publishing finishes
• Add unit coverage for publish cleanup behavior

Test plan

• npm --prefix packages/oc run build
• npx --prefix packages/oc mocha packages/oc/test/unit/registry-domain-extract-package.js packages/oc/test/unit/registry-routes-publish.js

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