[feat][broker] Add replicateSubscriptionsEnabled for namespace and topic

[nodece]

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 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:

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

Does this pull request potentially affect one of the following parts:

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• Dependencies (add or upgrade a dependency)
• The public API
• The schema
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• The threading model
• The binary protocol
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• The admin CLI options
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