Add classifier CLI script tests

[sarahyurick]

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Loosely modeled after the NeMo setup:

• https://github.com/NVIDIA/NeMo/tree/main/tests/functional_tests
• https://github.com/NVIDIA/NeMo/blob/main/.github/workflows/cicd-main-e2e-tests.yml

TODO:

• [x] aegis_classifier_inference
• [x] content_type_classifier_inference
• [x] domain_classifier_inference
• [x] fineweb_edu_classifier_inference
• [x] fineweb_mixtral_edu_classifier_inference
• [x] fineweb_nemotron_edu_classifier_inference
• [x] instruction_data_guard_classifier_inference
• [x] multilingual_domain_classifier_inference
• [x] prompt_task_complexity_classifier_inference
• [x] quality_classifier_inference