feat: Add session status checker GQL mutation

[fregataa]

Mutation

mutation CheckandtransitSession {
    check_and_transit_session_status(
        input: {ids: ["SESSION-ID",]}
    ) {
        sessions {
            id
            row_id
            name
            status
            status_history
            occupied_slots
        }
    }
}

Response

{
    "data": {
        "check_and_transit_session_status": {
            "item": [
                {
                    "id": "NODE-ID",
                    "row_id": "SESSION-ID",
                    "name": "SESSION-NAME",
                    "status": "RUNNING",
                    "status_history": "{\"PENDING\": \"2024-09-14T03:35:54.218019+00:00\", \"RUNNING\": \"2024-09-14T03:36:05.431593+00:00\", \"PREPARING\": \"2024-09-14T03:35:55.013239+00:00\", \"SCHEDULED\": \"2024-09-14T03:35:54.996003+00:00\"}",
                    "occupied_slots": "{\"cpu\": \"90\", \"mem\": \"30198988800\", \"cuda.device\": \"0\"}"
                }
            ]
        }
    }
}

Checklist: (if applicable)

• [x] Milestone metadata specifying the target backport version
• [x] API server-client counterparts (e.g., manager API -> client SDK)

---

📚 Documentation preview 📚: https://sorna--2836.org.readthedocs.build/en/2836/

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📚 Documentation preview 📚: https://sorna-ko--2836.org.readthedocs.build/ko/2836/

[fregataa]

• #2836 👈
• #2946
• main

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