Do not merge until v7.5.2: tidb config: add concurrently-init-stats (#17471)

[ti-chi-bot]

This is an automated cherry-pick of #17471

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• v8.1 (TiDB 8.1 versions)
• v8.0 (TiDB 8.0 versions)
• v7.6 (TiDB 7.6 versions)
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What is the related PR or file link(s)?

• This PR is translated from:

pingcap/docs-cn#17316

• Other reference link(s):

pingcap/tidb#52102

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

[hfxsd]

/approve

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