v7.5.7: change the default value of tidb_enable_historical_stats

[Oreoxmt]

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• This PR is translated from: v7.5.7: change the default value of tidb_enable_historical_stats docs#21551
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[LGTM Timeline notifier]

Timeline:

• 2025-08-22 08:19:56.331573841 +0000 UTC m=+600804.274749357: ☑️ agreed by qiancai.