cloud: remove the support of in-place restore

[qiancai]

What is changed, added or deleted? (Required)

This PR removes the instructions of in-place restore for TiDB Cloud Starter and Essential.

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• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

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• Delete files
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[gemini-code-assist]

Summary of Changes

Hello @qiancai, 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 streamlines the TiDB Cloud backup and restore documentation by removing support for in-place restores. The updated content now solely focuses on the process of restoring data to a new cluster, simplifying the user experience and reflecting current platform capabilities.

Highlights

• Removal of In-place Restore: The documentation for TiDB Cloud has been updated to remove all mentions and instructions related to the 'in-place restore' functionality.
• Exclusive New Cluster Restore: The guide now exclusively details the process of restoring data to a new TiDB Cloud cluster, simplifying the restore options presented to users.

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[gemini-code-assist]

Code Review

This pull request removes documentation for the in-place restore feature for TiDB Cloud Serverless and Essential clusters, which is a straightforward change. My review focuses on ensuring the remaining instructions for restoring to a new cluster are clear and easy to follow. I've suggested one change to improve the clarity of the restore steps, based on the provided style guide's emphasis on clear instructions.