Enable GPU Testing for LLM Blueprints

[andreyvelich]

What you would like to be added?

We will soon introduce LLM Blueprints which typically require GPUs to run them: #2410.
To support this, we need to explore using GitHub self-hosted runners with GPU support.

If we can get them, we need to see if we can deploy Kubernetes cluster with these runners and NVIDIA GPU Operator.

cc @Electronic-Waste @astefanutti @kubeflow/wg-training-leads @deepanker13 @saileshd1402 @franciscojavierarceo

Why is this needed?

We need GPU for our testing infrastructure.

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