extract create group to a function

[dsafdsa1]

What type of PR is this?

/kind feature

What this PR does / why we need it:

It extracts node group creation into a separate function, enabling its reuse in a custom cloud provider orchestrator.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: dsafdsa1 (aead0de)

[k8s-ci-robot]

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[kisieland]

/lgtm

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[jayantjain93]

/lgtm

[jayantjain93]

/approve

[dsafdsa1]

/assign x13n

[dsafdsa1]

/unassign x13n

[dsafdsa1]

/assign BigDarkClown

[BigDarkClown]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BigDarkClown, dsafdsa1, jayantjain93

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