Add input boxes for required user inputs

[claudevdm]

Add input boxes to user required inputs in example notebooks.

Colab diffs:
automatic_model_refresh

automatic_model_refresh.ipynb
bigquery_enrichment_transform.ipynb
bigtable_enrichment_transform.ipynb
vertex_ai_text_embeddings.ipynb
dataframe_api_preprocessing.ipynb
gemma_2_sentiment_and_summarization.ipynb
nlp_tensorflow_streaming.ipynb
run_inference_pytorch.ipynb
run_inference_sklearn.ipynb
run_inference_tensorflow.ipynb
run_inference_tensorflow_with_tfx.ipynb
run_inference_vertex_ai.ipynb
run_inference_vllm.ipynb
vertex_ai_feature_store_enrichment.ipynb
beam_nlp.ipynb

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[claudevdm]

R: @damccorm

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[damccorm]

Just had 2 minor comments, otherwise LGTM.

[damccorm]

Thanks!