tidb-cloud: clarify backup behavior during data import and scaling

[doc-claw-bot]

What is changed, added or deleted? (Required)

Clarify the backup note in tidb-cloud/backup-and-restore.md to reflect the current implementation:

• separate the data import and cluster scaling behaviors to avoid confusion
• state that automatic backup jobs are delayed during both data import and cluster scaling
• state that an automatic backup is skipped if cluster scaling delays it for more than 30 minutes
• keep the manual backup restriction explicit for data import and cluster scaling

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

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For details, see tips for choosing the affected versions.

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
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• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

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

• This PR is translated from:
• Other reference link(s):
  • https://tidb.atlassian.net/browse/TCOC-5468
  • https://docs.pingcap.com/tidbcloud/backup-and-restore/

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

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[gemini-code-assist]

Code Review

This pull request updates the TiDB Cloud backup and restore documentation to clarify how automatic and manual backups behave during data import and cluster scaling. The reviewer suggested using active voice instead of passive voice for these updates to improve clarity and adhere to the repository style guide.

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