Fix python runner image with pulsar newer than 3.0.0

[jiangpengcheng]

(If this PR fixes a github issue, please add Fixes #<xyz>.)

Fixes #565

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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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[yaalsn]

Thanks!