[INLONG-9651][Release] Bumped sub-modules' version to 1.12.0-SNAPSHOT and fix error in unit test

[luchunliang]

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• Fixes [Release] Bumped master branch version to 1.12.0-SNAPSHOT #9651

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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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  • 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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