Remove deprecated k8s.io/legacy-cloud-providers

[azylinski]

Replace single reference with cloud-provider-gcp

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This is part of an larger effort in k/k: https://kubernetes.io/blog/2023/12/14/cloud-provider-integration-changes/

Special notes for your reviewer:

New config it's an extension of an old one - it has an extra option: "stack-type" and all the previous ones are included already. In other words, in ensures compatibility.

Diff:

• NEW: https://github.com/kubernetes/cloud-provider-gcp/blob/66e890137b19d3808bac74e768177fa83e4f2225/providers/gce/gce.go#L201-L246
• OLD: https://github.com/kubernetes/legacy-cloud-providers/blob/v0.31.0-alpha.0/gce/gce.go#L175-L219

Does this PR introduce a user-facing change?

NONE

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

- [KEP-2395]: [Removing In-Tree Cloud Provider Code](https://github.com/kubernetes/enhancements/tree/master/keps/sig-cloud-provider/2395-removing-in-tree-cloud-providers)

[BigDarkClown]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: azylinski, BigDarkClown

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