changefeed: add constraint to Replication Factor and Partition Number

[grovecai]

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[ti-chi-bot]

Hi @grovecai. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Oreoxmt]

/ok-to-test

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-26 08:24:56.930556564 +0000 UTC m=+863985.678179660: ☑️ agreed by Oreoxmt.
• 2024-02-26 08:31:15.135868674 +0000 UTC m=+864363.883491784: ☑️ agreed by qiancai.

[Oreoxmt]

/approve

[ti-chi-bot]

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