[improve][broker] Pass the authorization when user lookup transactionCoordinator topic

[TakaHiR07]

Fixes #xyz

Main Issue: #xyz

PIP: #xyz

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

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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

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