add system variable tidb_max_auto_analyze_time

[qiancai]

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• This PR is translated from: add system variable tidb_max_auto_analyze_time docs-cn#9652
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• shichun-0415

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[shichun-0415]

LGTM

[shichun-0415]

LGTM

[qiancai]

/remove-status LGT1
/status LGT2

[qiancai]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 39b4711

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #8873.