migration: update k8s.gcr.io references to registry.k8s.io

[VedantMadane]

Fixes #4780. This PR updates the pause image pull logic in \infra/gcp/bash/lib_gcr.sh\ and the architectural labels in \diagram.svg\ to use
egistry.k8s.io\ instead of \k8s.gcr.io.

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• ✅ login: VedantMadane / name: Vedant Madane (71cbcaa)

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[VedantMadane]

Gentle ping -- this migration PR is still mergeable and ready for review.

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[VedantMadane]

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