[cherry-pick] br: add use constraint with CDC and drainer (#3750)#4184
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* br: add use constraint with CDC and drainer * br: fix a bad format * Apply suggestions from code review Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com> * Update backup-and-restore-faq.md Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
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Cherry-picking #3750
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What is changed, added or deleted? (Required)
现今 CDC 和 Drainer 无法同步 BR 所恢复的数据，同时 BR 恢复到上游集群可能会让 CDC / Drainer 工作异常。
于是在文档中标注出来。
Which TiDB version(s) do your changes apply to? (Required)