Fix go CVE-2025-61729

[yaalsn]

Motivation

Fix CVE https://github.com/streamnative/eng-support-tickets/issues/3409

Modifications

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Verifying this change

• [x] Make sure that the change passes the CI checks.

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

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This change is already covered by existing tests, such as (please describe tests).

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This change added tests and can be verified as follows:

(example:)

• 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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