fix: vGPU option is empty when creating harvester downstream cluster

[houhoucoop]

Summary

Fixes #15801

Occurred changes and/or fixed issues

• Rewrite vGpuOptions to return label and values

Technical notes summary

N/A

Areas or cases that should be tested

N/A

Areas which could experience regressions

• Cluster create page

Screenshot/Video

Screen.Recording.2025-10-30.at.5.13.51.PM.mov

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[richard-cox]

We need to be careful on the branch this merges to. Once 2.13.0 has been released master will track 2.14.0 and a new release-2.13 branch will be created that will be for 2.13.1

[a110605]

Hi @houhoucoop , let's put this fix in milestone 2.13.0. Is it okay for you?

[a110605]

Looks good.