fix: remove pause-rollout=false

[jiangpengcheng]

Motivation

Set --pause-rollout=false in manager will make it un-configurable

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

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