preingestion: power off host before BMC firmware update

[williampnvidia]

Summary

• add preingestion_power_off_host_before_update firmware-entry flag
• power off host immediately before preingestion host BMC firmware updates when the flag is set
• ignore the flag for DPU/BlueField endpoints because DPU must remain powered for firmware update
• cover host-BMC power-off behavior and LenovoAMI firmware-config fallback in tests

Deployment note

This PR does not add a new checked-in Lenovo HS350 firmware entry. To enable this for the Lenovo HS350 / HS350X V3 runtime config that already performs the BMC firmware update, set this on the existing BMC known_firmware entry:

preingestion_power_off_host_before_update = true

The LenovoAMI fallback test verifies that an endpoint reporting LenovoAMI can still match the Lenovo HS350 firmware metadata carrying this flag.

Testing

• cargo check -q -p carbide-preingestion-manager
• cargo test -q -p carbide-firmware lenovoami -- --nocapture
• cargo test -q -p carbide-api-core --no-default-features power_off_before_update --no-run
• cargo fmt

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[williampnvidia]

This is no longer needed. Closing.