[INLONG-3264][Manager] Fix deadlock in stream source

[kipshi]

Title Name: [INLONG-3264]Fix deadlock in stream source

where XYZ should be replaced by the actual issue number.

Fixes #3264

Motivation

Modifications

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• 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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