fix: report ASR model type instead of name in unknown type error

[andrewwhitecdw]

When load_evaluation_models receives an unsupported asr_model_type, the error message was printing the model name/path instead of the invalid type, making debugging harder.

• Fixed the interpolation in nemo/collections/tts/modules/magpietts_inference/evaluate_generated_audio.py
• Added a unit test verifying the error message contains the invalid type value

Tested:

uv run python -m pytest tests/collections/tts/modules/magpietts_inference/test_evaluate_generated_audio.py -v
# 1 passed

cc @blisc for TTS review

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[andrewwhitecdw]

Could a maintainer please add the Run CICD label to trigger CI? As an outside contributor I don't have permission to apply labels myself. Thanks!