[tei] feat: add runtimeClassName option

[driv]

What this PR does / why we need it:

Adds a runtimeClassName value to the tei chart so the pod can be scheduled with a non-default runtime, e.g. nvidia when running the GPU image on nodes with the NVIDIA device plugin (the default runc runtime cannot use GPUs on clusters without CDI).

image:
  tag: 1.6 # GPU image
runtimeClassName: nvidia
resources:
  limits:
    nvidia.com/gpu: 1

This mirrors the runtimeClassName support already present in the milvus chart (queryNode.runtimeClassName / indexNode.runtimeClassName).

Checklist

• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [mychartname])
• PR only contains changes for one chart

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This pull-request has been approved by: driv
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