Refactor spec/semconv integration workflows: extract pick-branch helper#9682

chalin merged 2 commits intoopen-telemetry:mainopen-telemetry/opentelemetry.io:mainfrom

chalin:chalin-m24-fix-spec-upd-action-2026-0418chalin/opentelemetry.io:chalin-m24-fix-spec-upd-action-2026-0418Copy head branch name to clipboard