update cluster failover analysis

[XiShanYongYe-Chang]

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/kind documentation

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Which issue(s) this PR fixes:
Fixes #

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[gemini-code-assist]

Summary of Changes

Hello @XiShanYongYe-Chang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing the clarity and accuracy of the Karmada documentation regarding cluster failover mechanisms. It refines the explanation of how cluster taints are applied and managed, distinguishing between controller-managed NoSchedule taints and user-managed NoExecute taints. Additionally, a key documentation file has been renamed to better represent its content, improving overall document organization and user experience.

Highlights

• Documentation Renaming: The document determine-cluster-failures.md has been renamed to cluster-status-maintenance.md in both English and Chinese versions to better reflect its content.
• Clarified Taint Management: The failover-analysis.md document has been updated to clarify that the Karmada controller only automatically adds NoSchedule taints to unhealthy clusters. The management of NoExecute taints is now explicitly stated as a user responsibility, with a reference to the cluster-taint-management.md guide.
• Removed Automatic NoExecute Taint Details: Sections detailing the automatic addition of NoExecute taints and automatic toleration by webhooks have been removed from failover-analysis.md, aligning with the updated taint management policy.
• Navigation Update: The sidebars.js file has been updated to reflect the new name and order of the documentation files, ensuring correct navigation within the user guide.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for cluster failover analysis. The main change is to clarify that Karmada no longer automatically adds NoExecute taints to unhealthy clusters; this is now a manual operation for users. The documentation for how NoSchedule taints are added is also updated. These changes are reflected in both the English and Chinese documentation files.

My review includes a few suggestions to improve clarity and fix a typo. I've pointed out some awkward phrasing in both versions of the failover-analysis.md document and a significant typo in the Chinese version. After addressing these minor issues, the documentation will be more accurate and easier to understand.

[XiShanYongYe-Chang]

/cc @RainbowMango