canary-1b is not exportable
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**Describe the bug**

The Canary model is not exportable to onnx. It seems like it was not configured to be exportable.

**Steps/Code to reproduce bug**
```
import nemo.collections.asr as nemo_asr

def main():
    # Load Canary model
    model_name = "nvidia/canary-1b"
    print(f"Loading model: {model_name}")
    model = nemo_asr.models.ASRModel.from_pretrained(model_name=model_name)
    
    # Prepare for export
    model.eval()
    
    # Try to export - this will raise the error
    output_path = "canary.onnx"
    print("Attempting ONNX export...")
    model.export(
        output_path,
        onnx_opset_version=17,
        verbose=True
    )

if __name__ == "__main__":
    main()
```

This gives the error:
```
AttributeError: 'EncDecMultiTaskModel' object has no attribute 'output_names'
Traceback:
File "venv/lib/python3.11/site-packages/streamlit/runtime/scriptrunner/exec_code.py", line 88, in exec_func_with_error_handling
    result = func()
             ^^^^^^
File "venv/lib/python3.11/site-packages/streamlit/runtime/scriptrunner/script_runner.py", line 579, in code_to_exec
    exec(code, module.__dict__)
File "app.py", line 22, in <module>
    main()
File "app.py", line 15, in main
    model.export(
File "nemo/core/classes/exportable.py", line 117, in export
    out, descr, out_example = model._export(
                              ^^^^^^^^^^^^^^
File "nemo/core/classes/exportable.py", line 196, in _export
    output_names = self.output_names
                   ^^^^^^^^^^^^^^^^^
File "venv/lib/python3.11/site-packages/torch/nn/modules/module.py", line 1931, in __getattr__
    raise AttributeError(
```


**Expected behavior**

I would expect to be able to export this model.

**Environment overview (please complete the following information)**

 - Environment location: Mac
 - Method of NeMo install: pip install