v8.5.5 br: improve visualization of BR (#20493)

[ti-chi-bot]

This is an automated cherry-pick of #20493

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• This PR is translated from: br: improve visualization of BR docs-cn#20025
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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, 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 significantly enhances the documentation for the Backup & Restore (BR) tool by providing a more detailed and granular visualization of both backup and restore operations. The changes aim to improve user understanding of the progress and underlying processes during these critical database operations, making the documentation more informative and user-friendly.

Highlights

• Improved Restore Progress Visualization: The documentation now reflects a more granular breakdown of the restore process, replacing a single 'Full Restore' progress bar with 'Split&Scatter Region', 'Download&Ingest SST', and 'Restore Pipeline' steps, offering better insight into the restore operation's stages.
• Enhanced Backup Statistics Explanation: New explanations have been added for various backup statistics, including total-ranges, ranges-succeed, ranges-failed, backup-total-ranges, write-CF-files, and default-CF-files, providing a clearer understanding of backup summary outputs.
• Detailed Restore Statistics Explanation: The documentation now includes detailed descriptions for restore statistics such as total-ranges, ranges-succeed, ranges-failed, merge-ranges, split-region, restore-files, write-CF-files, default-CF-files, and split-keys, aiding users in interpreting restore summary information.

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[gemini-code-assist]

Code Review

This pull request improves the visualization of Backup & Restore (BR) operations by updating the progress bar display for restore tasks and adding more detailed metrics to the summary outputs. The changes enhance clarity for users monitoring backup and restore processes. My review focuses on improving the readability and conciseness of the new documentation, in line with the repository's style guide. I've suggested replacing ampersands with 'and' for a more formal tone and rephrasing metric descriptions to be more direct.