[INLONG-3210][Manager] Support group batch query in manager client

[yunqingmoswu]

Title Name: [INLONG-3210] [Manager] Support group batch query in manager client

Fixes #3210

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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• 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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