Greenfield: Implement MockGCP and Alignment for NetworkManagementVpcFlowLogsConfig

[walle-agent-bot]

Please follow the skill .gemini/skills/kcc-direct-mockgcp-implementer/SKILL.md to implement Phase 3 (MockGCP and Alignment) for NetworkManagementVpcFlowLogsConfig to verify behavioral correctness against the simulated GCP services.

[argus-watcher-bot]

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