Fix add_labels.test.cjs test framework and empty labels behavior#9006

pelikhan merged 3 commits intojsweep-clean-add-labels-1c0bc3cff1aee696githubnext/gh-aw:jsweep-clean-add-labels-1c0bc3cff1aee696from

copilot/sub-pr-9005githubnext/gh-aw:copilot/sub-pr-9005Copy head branch name to clipboard