feat: deserialize object from multiple yaml documents

[fengxsong]

🤖 Generated by Copilot at c20caa7

Summary

♻️🔧✨

This pull request refactors the YAML handling and parsing across the project by using a new YAML utility package and a stricter unmarshaling mode. It also updates the functions that check or manipulate the configuration files of k3s, crictl, registry, and kubeadm to use the new YAML package and mode. The goal is to improve the code quality, validation, and consistency of working with YAML data and files.

Sing, O Muse, of the valiant deeds of the sealos heroes,
Who dared to tame the mighty beasts of kubernetes and k3s,
And who refined their craft with skillful tools of yaml and crictl,
And who merged and checked their configs with UnmarshalToMap and Strict.

Walkthrough

• Replace UnmarshalData function with UnmarshalToMap function from yaml package for unmarshaling YAML data into maps in Check functions of crictl_checker.go and registry_checker.go files (link, link)
• Clean up import statements and use yaml package in config.go file of k3s package (link)
• Simplify and validate parsing of k3s configuration file using Unmarshal function from yaml package in config.go file of k3s package (link)
• Replace UnmarshalData function with UnmarshalToMap function from yaml package for unmarshaling YAML data into maps in saveNewKubeadmConfig and mergeWithBuiltinKubeadmConfig functions of certs.go and kubeadm.go files of kubernetes package (link, link)
• Rename Unmarshal function to UnmarshalToMap and add unmarshalStrict function for strict unmarshaling of YAML data into structs in yaml.go file of yaml package (link)
• Remove unused ToYAMLs function and add Marshal function for marshaling objects into YAML data in yaml.go file of yaml package (link)
• Modify UnmarshalFile function to use unmarshalStrict function and add IsNil function for checking nil or empty YAML data in yaml.go file of yaml package (link)

[sealos-ci-robot]

🤖 Generated by lychee action

Summary

Status	Count
🔍 Total	932
✅ Successful	392
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	539
❓ Unknown	0
🚫 Errors	0

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[codecov]

Codecov Report

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[sealos-ci-robot]

/cherry-pick release-v4.4

[sealos-ci-robot]

🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/labring/sealos/actions/runs/6112707850