[fix-4486][dink-cdc] The whole library synchronizes pgsql to doris, and the deleted data cannot be synchronized.

[qzztf]

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This pull request is code cleanup without any test coverage.

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[aiwenmo]

Hi. I think the declaration of the primary key should be done at the Sink stage, that is, in the Create Table statement. Please check in the log whether the Create Table statement generated by the program contains the correct primary key information.

[aiwenmo]

#4525