feat: recycle connection in broker

[leizhiyuan]

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

Fixes #16050

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Master Issue: #

Motivation

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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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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

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• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)
• The rest endpoints: (yes / no)
• The admin cli options: (yes / no)
• Anything that affects deployment: (yes / no / don't know)

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[github-actions]

The pr had no activity for 30 days, mark with Stale label.

[leizhiyuan]

Since it takes a long time and the code differences are too large, I will close this PR.