Update Kind to v0.31.0 for Kubernetes 1.35

[danish9039]

This updates the shared Kind bootstrap to kind v0.31.0 and Kubernetes v1.35.0, switches the kubeadm patch to v1beta3, and removes the stale containerd registry mirror patch that breaks the kindest/node:v1.35.0 image.

During validation, the real breakage turned out to be the old containerdConfigPatches mirror block in tests/install_KinD_create_KinD_cluster_install_kustomize.sh. That patch no longer works with the kindest/node:v1.35.0 image, so this PR removes it.

Validation:

• bash -n tests/install_KinD_create_KinD_cluster_install_kustomize.sh
• local 3-node Kind smoke with kind v0.31.0 and kindest/node:v1.35.0
• fork PR CI in danish9039/manifests#3
• upstream PR CI

The separate Helm/Kustomize comparison drift for KServe Models Web App is being handled in #3437.

[github-actions]

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[Copilot]

Pull request overview

This PR updates the KinD bootstrap infrastructure from Kind v0.30.0 and Kubernetes v1.34.0 to Kind v0.31.0 and Kubernetes v1.35.0. The primary change addresses a critical bootstrap regression caused by the legacy containerdConfigPatches mirror configuration that conflicts with containerd v2.2.0 in the newer Kubernetes node image. The PR also updates the kubeadm patch API version from v1beta2 to v1beta3 and adds a regression test to maintain the bootstrap contract.

Changes:

• Updated Kind version to v0.31.0 and pinned Kubernetes node image to v1.35.0 with a specific digest
• Removed the legacy containerdConfigPatches registry mirror block that was breaking containerd initialization in kindest/node:v1.35.0
• Updated kubeadm patch API version from v1beta2 to v1beta3
• Refactored node image configuration to use a dedicated variable for consistency across all three node definitions
• Added a regression test to validate the bootstrap contract and prevent future regressions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tests/install_KinD_create_KinD_cluster_install_kustomize.sh	Updated Kind and Kubernetes versions, removed legacy containerd config, updated kubeadm API version, and refactored to use environment variable for node image
tests/kind_bootstrap_upgrade_test.py	New regression test that validates the bootstrap contract including versions, API versions, and absence of problematic legacy configurations

[juliusvonkohout]

Thank you
/lgtm
/approve

[google-oss-prow]

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