tool: add YAML node helpers for workflow timeout updates

[baohuy1303]

Summary

A part of #23043

Adds a small YAML helper foundation for future workflow timeout updates.

This PR is intentionally limited to parsing and modifying YAML through yaml.Node. It does not add the timeout updater, GitHub workflow stats integration, or scheduled automation. In tests, it grabs the 1st step manually, but later PRs will make this dynamic.

What changed

• Added ordered YAML mapping/sequence helpers:
  • Entries
  • Elements
  • Get
  • GetString
  • SetScalar
  • EncodeYAML
• Added tests proving we can add and update timeout-minutes through YAML nodes.
• Added tests covering comment preservation and stable key ordering for the helper behavior.
• Moved gopkg.in/yaml.v3 to a direct dependency in the hack module.

Tests

cd hack
go test ./workflow-stats

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: baohuy1303
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[kubernetes-prow]

Hi @baohuy1303. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[minikube-bot]

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