Update nodegoup for CoreWeave Provider

[keedya]

What type of PR is this?

bug

What this PR does / why we need it:

CoreWeave Provider; Correct the behavior when no nodegroups are available and nodepool has autoscaler disabled. It needs to return empty slice instead of an error. Currently it returns an error and the autoscaler marks itself unhealthy and restart.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

coreweave: don't return error when no nodegroups and autoscaler disabled

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

[k8s-ci-robot]

Hi @keedya. Thanks for your PR.

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[elmiko]

i am unfamiliar with the coreweave provider, but these changes seem reasonable to me.

[jackfrancis]

/ok-to-test
/kind bug
/release-note-edit

coreweave: don't return error when no nodegroups and autoscaler disabled

[jackfrancis]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, keedya

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