Upgrading Sagemaker docs and tutorials to sagemaker-sdk v3

[dwarez]

Note

Low Risk
Changes are docs and notebooks only; they do not alter runtime libraries, though incorrect SDK v3 examples could mislead users configuring AWS training or endpoints.

Overview
This PR refreshes Hugging Face on AWS SageMaker documentation and example notebooks for SageMaker Python SDK v3, replacing v2 patterns (HuggingFace / HuggingFaceModel) with ModelTrainer for jobs and ModelBuilder (or sagemaker.core.resources where Neuron/TGI builders do not apply) for inference.

Tutorials under docs/sagemaker/source/ now call out pip install "sagemaker>=3.0.0", image_uris.retrieve, InputData channels, and updated deploy/train flows (including JumpStart via ModelBuilder(model=...)). Example notebooks cover embeddings (TEI), Lighteval on ModelTrainer, TRL CLI SFT, DeepSeek OCR batch jobs, Inferentia2 Llama via core Model/Endpoint APIs, and fine-tune-then-deploy embedding workflows.

.gitignore adds .ipynb_checkpoints/ so local Jupyter checkpoint dirs from the updated notebooks are not committed.

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[ehcalabres]

Hey @dwarez! Thanks for all the updates! As per the changes you made, everything looks good to me. I just have a couple of comments regarding unchanged sections:

• Do we want to include the note about sagemaker v3 on all notebooks? If so, we should add it here and here too
• I think that the neuron agent example is still in the old SDK version, maybe you missed that one?

[dwarez]

Hey @dwarez! Thanks for all the updates! As per the changes you made, everything looks good to me. I just have a couple of comments regarding unchanged sections:

* Do we want to include the note about sagemaker v3 on all notebooks? If so, we should add it [here](docs/sagemaker/notebooks/sagemaker-sdk/deepseek-ocr-sagemaker/sagemaker-notebook.ipynb) and [here](docs/sagemaker/notebooks/sagemaker-sdk/fine-tune-trl-cli/sagemaker-notebook.ipynb) too

* I think that the [neuron agent example](docs/sagemaker/notebooks/sagemaker-sdk/neuron-agent-inf/sagemaker-notebook.ipynb) is still in the old SDK version, maybe you missed that one?

hey @ehcalabres thanks for the review 😄

You're right the banner was missing from the fine-tune-trl notebook, I added it.
For the neuron agent example, I didn't commit anything because I wasn't able to test it end to end because of ml.inf2.24xlarge availability. I spoke with @tengomucho and maybe we can eventually fix that example in another PR.