*: add tidb_auto_analyze_concurrency

[hawkingrei]

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• This PR is translated from: *: add tidb_auto_analyze_concurrency docs-cn#18651

pingcap/docs-cn#18651

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Timeline:

• 2024-09-23 06:35:29.376070119 +0000 UTC m=+1461399.116494042: ☑️ agreed by Oreoxmt.

[qiancai]

这个变量和 tidb_auto_build_stats_concurrency 的区别是什么呢，描述看起来是一样的

[hawkingrei]

这个是一个 analyze 任务内部的并发。上面那个是可以并发执行多少 analyze 任务。