feat: Fix system order for Lenovo GB300

[hakhondzadeh]

Previous platforms found System_0 in systems.first() but Lenovo GB300 has it as the second.

GB200 redfish/v1/systems/index.json

{
    "@odata.id": "/redfish/v1/Systems",
    "@odata.type": "#ComputerSystemCollection.ComputerSystemCollection",
    "Members": [
        {
            "@odata.id": "/redfish/v1/Systems/System_0"
        },
        {
            "@odata.id": "/redfish/v1/Systems/HGX_Baseboard_0"
        }
    ],
    "Members@odata.count": 2,
    "Name": "Computer System Collection"
}

GB300, redfish/v1/systems/index.json:

  "@odata.context": "/redfish/v1/$metadata#ComputerSystemCollection.ComputerSystemCollection",
    "@odata.etag": "\"1765104551\"",
    "@odata.id": "/redfish/v1/Systems",
    "@odata.type": "#ComputerSystemCollection.ComputerSystemCollection",
    "Description": "Collection of Computer Systems",
    "Members": [
        {
            "@odata.id": "/redfish/v1/Systems/HGX_Baseboard_0"
        },
        {
            "@odata.id": "/redfish/v1/Systems/System_0"
        }
    ],
    "Members@odata.count": 2,
    "Name": "Systems Collection"

This PR introduces LenovoGN300 vendor and finds the system_0 with iterating over members rather than taking the first.

[krish-nvidia]

detect_lenovo_gb300 already guarantees that System_0 exists, you can replace it with:

let system_id: &str = if vendor == RedfishVendor::AMI
        && Self::detect_lenovo_gb300(&s, &systems, &chassis).await?
    {
        "System_0"
    } else { ...

[krish-nvidia]

Checking systems here again feels redundant, maybe you can replace it with:

    baseboard_model.is_some_and(|m| m.to_lowercase().contains("gb300"))
        && is_lenovo(host_system_manufacturer)
        && is_lenovo(host_chassis_manufacturer)

[martinraumann]

Did we mean to remove NTP support here that was just added in #87?