kubeadm: remove MutateImageRepository for registry change

[pacoxu]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

follow todo in #110343

Which issue(s) this PR fixes:

part of kubernetes/kubeadm#2671

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

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

[k8s-ci-robot]

@pacoxu: This issue is currently awaiting triage.

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[pacoxu]

/assign @neolit123

[neolit123]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: neolit123, pacoxu

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• cmd/kubeadm/OWNERS [neolit123]

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[neolit123]

/lgtm