v8.5.5 br: add compatibility between log backup and PITR (#20485)

[ti-chi-bot]

This is an automated cherry-pick of #20485

First-time contributors' checklist

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What is changed, added or deleted? (Required)

增加了日志备份和恢复的兼容性章节。
Added a paragraph that describes the compatibility between log backup and snapshot restore.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 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)

What is the related PR or file link(s)?

• This PR is translated from: br: add compatibility between log backup and PITR docs-cn#20002
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[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 enhances the TiDB Backup & Restore (BR) documentation by adding crucial information regarding the compatibility between continuous log backup tasks and snapshot restore operations. It clarifies the specific conditions under which these two processes can coexist seamlessly from TiDB v9.0.0 onwards, and provides a structured guide for users to manage scenarios where direct compatibility is not met, ensuring data integrity and operational clarity during recovery procedures.

Highlights

• New Documentation Section: A new section titled 'Compatibility between ongoing log backup and snapshot restore' has been added to the br-pitr-manual.md file.
• Compatibility Conditions: The documentation now specifies conditions under which a snapshot restore can be performed while a log backup task is running, starting from TiDB v9.0.0.
• Incompatible Scenarios Guidance: Clear steps are provided for users to follow if the compatibility conditions are not met or if a point-in-time recovery is required during an ongoing log backup.
• BR Version Requirement: A note has been added emphasizing the requirement to use BR v9.0.0 or later when restoring a log backup that includes records of snapshot restore data.

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[gemini-code-assist]

Code Review

This pull request adds documentation regarding the compatibility between log backup and snapshot restore. My review focuses on improving the clarity, grammar, and formatting of the new content to align with the documentation style guide. I have provided several suggestions to make the text more readable and easier for users to understand.

[ti-chi-bot]

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