Check cluster_dims attribute exists before access (pytorch#167187)

Error in Helion CI's AMD job: https://github.com/pytorch/helion/actions/runs/19118581048/job/54633730633
```
>                   (binary.metadata.num_ctas, *binary.metadata.cluster_dims)
                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                    if hasattr(binary, "metadata")
                    else ()
                )
            ),
            "function": get_first_attr(binary, "function", "cu_function"),
            "runner": get_first_attr(binary, "run", "c_wrapper"),
            "math": math_lib,
            "torch": torch_lib,
            "triton": triton_lib,
        }
E       torch._inductor.exc.InductorError: AttributeError: 'KernelMetadata' object has no attribute 'cluster_dims'
```

Pull Request resolved: pytorch#167187
Approved by: https://github.com/oulgen

Author: yf225

torch/_inductor/runtime/triton_heuristics.py

@@ -1851,6 +1851,8 @@ def make_launcher(self) -> LauncherType:
                 else (
                     (binary.metadata.num_ctas, *binary.metadata.cluster_dims)
                     if hasattr(binary, "metadata")
+                    and hasattr(binary.metadata, "num_ctas")
+                    and hasattr(binary.metadata, "cluster_dims")
                     else ()
                 )
             ),