*: upgrade tidb_auto_analyze_partition_batch_size default value

[hawkingrei]

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pingcap/docs#19817

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[qiancai]

Removed the needs-cherry-pick-release-8.2 label because the v8.2 docs have been archived at https://docs-archive.pingcap.com/zh/tidb/v8.2 and will no longer receive new updates.

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pingcap/docs#19817 (comment)