Remove pkg/utils/slice dependeny in kube-proxy

[uablrek]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

As a step towards move pkg/proxy to k8s.io/kube-proxy the pkg/utils/slice package is replaced with k8s.io/utils/strings/slices, see kubernetes/utils#208.

The k8s.io/utils/strings/slices is in turn intended to be replaced with the standard "slices" package proposed in golang/go#45955.

Which issue(s) this PR fixes:

Part of #92369

Special notes for your reviewer:

The update of the k8s.io/utils version should probably not be done in this PR but in some more controlled way. I am not familiar with the procedure but the update is kept in it's own commit (which should not be reviewed).

Does this PR introduce a user-facing change?

NONE

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

N/A

[k8s-ci-robot]

@uablrek: This issue is currently awaiting triage.

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[uablrek]

Converted to draft. Obviously just updating vendor/ is not the way to go. Nothing works and all sig's and area's were added.

[uablrek]

Commands executed;

git clean -dxf
hack/pin-dependency.sh k8s.io/utils efc7438f0176a4a
hack/update-vendor.sh
hack/verify-vendor.sh
hack/lint-dependencies.sh
hack/update-internal-modules.sh
make WHAT=cmd/kube-proxy

[rikatz]

/lgtm
/assign @thockin

Tim, one less pkg/utils thing :D

@uablrek Thanks!!

[caesarxuchao]

/remove-sig api-machinery

[thockin]

Thanks!

Should we leave a pointer in pkg/utils telling new users not to use it?

Will you also follow up with the last users of it?

/lgtm
/approve

[cheftako]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheftako, thockin, uablrek

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• pkg/proxy/OWNERS [thockin]
• vendor/OWNERS [thockin]

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[uablrek]

k8s.io/utils/ has a new version. Only a commit to add vendor/k8s.io/utils/strings/slices/ was needed this time.

[thockin]

/lgtm