scheduller(ticc): fix uneven write keys distribution (#9664)

[ti-chi-bot]

This is an automated cherry-pick of #9664

What problem does this PR solve?

Issue Number: close #9665

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

 `None`.

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	646075d	link	true	/test verify

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[nongfushanquan]

scale-out feature doesn't exist in the version 6.5

[nongfushanquan]

/close

[ti-chi-bot]

@nongfushanquan: Closed this PR.

In response to this:

/close

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