v8.5.5 br: pitr filter feature release doc (#21109)

[ti-chi-bot]

This is an automated cherry-pick of #21109

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• master (the latest development version)
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• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
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What is the related PR or file link(s)?

• This PR is translated from:
  br: pitr filter feature release doc docs-cn#20450
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• Delete files
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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 updates the TiDB documentation for Point-in-Time Recovery (PITR) to reflect new features and operational enhancements introduced in TiDB v9.0.0. The changes provide comprehensive guidance on filtering data during PITR, executing concurrent restore tasks, and managing compatibility with ongoing log backups. Additionally, it introduces a new command for gracefully aborting failed restore processes, improving the overall robustness and user experience of backup and restore operations.

Highlights

• PITR Data Filtering: Documentation has been added for using filters during Point-in-Time Recovery (PITR) to restore specific databases or tables, providing fine-grained control over the restore process. This feature is available from TiDB v9.0.0.
• Concurrent PITR Restores: The documentation now includes details on performing multiple PITR restore tasks concurrently, enhancing efficiency for large-scale data recovery scenarios in TiDB v9.0.0 and later.
• Log Backup and Restore Compatibility: New sections explain the compatibility between ongoing log backup tasks and both snapshot and PITR restore operations, outlining conditions for seamless integration and handling potential data inconsistencies.
• Abort Restore Operations: Instructions for using the tiup br abort command have been added, detailing how to clean up metadata and checkpoint data for failed restore operations.

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[gemini-code-assist]

Code Review

This pull request adds documentation for new PITR features available in TiDB v9.0.0, such as filtering, concurrent restores, and aborting operations. My review includes a critical fix for unresolved merge conflict markers that were left in the document. I have also provided several suggestions to improve clarity and conciseness, aligning with the repository's style guide for technical documentation.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[lilin90]

Note

First merge #22168 and then merge this PR.