Pre-test CPP 4.1.0-candidate-1

[shibd]

Motivation

Pre test cpp release: https://dist.apache.org/repos/dist/dev/pulsar/pulsar-client-cpp/pulsar-client-cpp-4.1.0-candidate-1/

Modifications

Verifying this change

• 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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