Fix RMS rack firmware completion state

[anunna0]

Direct compute-tray firmware updates handled by RMS complete at the rack firmware layer. After RMS reported success, the machine controller incorrectly transitioned the host to CheckingFirmwareRepeatV2, causing a second firmware update through the legacy Redfish path. This duplicate attempt could fail with Invalid FW Package, leaving the host in FailedFirmwareUpgrade even though the RMS update had already succeeded.
This change treats a successful rack firmware update as the terminal state for the current host firmware scenario:

Unassigned hosts return to Ready.
Assigned hosts return to Assigned/Ready.
The host reprovisioning request is cleared.
No second legacy firmware update is launched.

backport of #5019 to v2.1

Related issues

#2016

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

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_{🕐 Last updated: 2026-08-14 23:30:36 UTC | Commit: 1212780}