sink(ticdc): fix duplicated replace when batch-replace is disabled (#4502)

[ti-chi-bot]

This is an automated cherry-pick of #4502

What problem does this PR solve?

Issue Number: close #4501

What is changed and how it works?

Remove duplicated sqls.

Check List

Tests

• Unit test
• Integration test

Release note

Fix a bug that MySQL sink will generate duplicated replace SQL if `batch-replace-enable` is disabled.

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[amyangfei]

/merge

[ti-chi-bot]

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

Commit hash: 1a79ab8

[VelocityLight]

/merge

[ti-chi-bot]

@VelocityLight: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

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/merge

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[amyangfei]

/merge

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@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

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