scripts: ci: check_compliance: fix misleading error message when Signed-off-by check fails#96871

cfriedt merged 2 commits intozephyrproject-rtos:mainzephyrproject-rtos/zephyr:mainfrom

mathieuchopstm:fix_compliance_signedoffmathieuchopstm/zephyr:fix_compliance_signedoffCopy head branch name to clipboard