🌱test: Add dedicated unit tests for getInstanceCPUOptionsRequest

[fangge1212]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

The unit tests for getInstanceCPUOptionsRequest are more lightweight and faster than testing various CPU option configurations through the larger CreateInstance function.

This commit refactors the existing tests by moving the specific CPU option test cases from TestCreateInstance into a new, more focused TestGetInstanceCPUOptionsRequest function. A single test case remains in TestCreateInstance to ensure the integration between the functions is correct.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist:

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Release note:

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @fangge1212. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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