dm-best-practices: Update for MySQL Compatible AUTO_INCREMENT

[dveeden]

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• [x] master (the latest development version)
• [x] v8.4 (TiDB 8.4 versions)
• [ ] v8.3 (TiDB 8.3 versions)
• [ ] v8.2 (TiDB 8.2 versions)
• [x] v8.1 (TiDB 8.1 versions)
• [ ] v7.5 (TiDB 7.5 versions)
• [ ] v7.1 (TiDB 7.1 versions)
• [ ] v6.5 (TiDB 6.5 versions)
• [ ] v6.1 (TiDB 6.1 versions)
• [ ] v5.4 (TiDB 5.4 versions)
• [ ] v5.3 (TiDB 5.3 versions)

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-10-25 01:50:34.881022914 +0000 UTC m=+575035.577813525: :ballot_box_with_check: agreed by lance6716.
• 2024-10-25 08:48:01.486478335 +0000 UTC m=+600082.183268945: :ballot_box_with_check: agreed by qiancai.

[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19225.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19226.