[INLONG-4953][Dashboard] Modify Greenplum sink parameters

[bluewang]

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• Fixes [Improve][Dashboard] Modify Greenplum sink parameters #4953

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Modifications

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Verifying this change

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• This change is a trivial rework/code cleanup without any test coverage.

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  (please describe tests)

• This change added tests and can be verified as follows:

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  • Added integration tests for end-to-end deployment with large payloads (10MB)
  • Extended integration test for recovery after broker failure

Documentation

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