Make AppLauncher teardown truthful and re-entrancy-safe; document mGPU NCCL workaround#6636

hujc7 merged 16 commits into

isaac-sim:developisaac-sim/IsaacLab:developfrom

hujc7:jichuanh/fix-abort-handler-reentrancyhujc7/IsaacLab:jichuanh/fix-abort-handler-reentrancyCopy head branch name to clipboard