qemu: log the crash information for TDX

qemu: log the crash information for TDX

Since QEMU 10.1.0 commit id '6e250463b08b' guest crash information for
TDX is available in the QEMU monitor, e.g.:

    {
        "timestamp": {
            "seconds": 1752118704,
            "microseconds": 27480
        },
        "event": "GUEST_PANICKED",
        "data": {
            "action": "pause",
            "info": {
                "error-code": 0,
                "message": "TD misconfiguration: SEPT #VE has to be disabled",
                "type": "tdx"
            }
        }
    }

    Let's log this information into the domain log file, e.g.:

    2025-07-10 03:39:18.243+0000: panic tdx: error_code='0x0' message='TD misconfiguration: SEPT #VE has to be disabled'

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>