🌱 chore: pin GitHub Actions to digest SHAs and replace setup-kind

[tesshuflower]

Pin all GitHub Actions to immutable commit SHAs to prevent supply chain issues from moving tags.

Replace engineerd/setup-kind with a direct kind create cluster run step using the kind binary pre-installed on GitHub-hosted runners. The Kubernetes node image version is now explicit via KUBERNETES_VERSION env variable set to v1.35.0 (same version previously used by kind v0.31.0 by default).

Removing setup-kind GH action as it appears to no longer be maintained, and now is causing issues when we use v0.6.2 as the tag v0.6.2 points to a version that is not correct (actual version is the branch v0.6.2). Note both are old and last modified in 2024.

> Note: Draft PR — to be merged after the Go 1.26 upgrade PR (#385) merges to avoid conflicts.

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• .github/workflows/cloudevents-integration.yml
• .github/workflows/dco.yml
• .github/workflows/go-postsubmit.yml
• .github/workflows/go-presubmit.yml
• .github/workflows/go-release.yml

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