Update GA_offlinefixer.ps1 to v1.3

[anmocanu]

This script repairs a broken Azure Guest Agent by restoring registry keys and binaries from a rescue VM. It includes detailed steps for loading the SYSTEM hive, backing up, injecting service keys, and verifying the restoration process. .VERSION
v1.3: [May 2026] - Updated the script (current)
- Aligned nested VM detection with win-LKGC guard pattern.
- Skips Get-VM safely when Hyper-V module is unavailable.
v1.2: [May 2026] - Updated the script again (current)
- Fixed breaking exception when the Hyper-V module is not installed on the host.
- Added explicit checking via Get-Module before executing nested VM discovery.
v1.1: [May 2026] - Updated the script
- Included advanced Gen2 unlettered EFI fallback and dynamic drive-letter assignment.
v1.0: Initial commit. This was the version 1.0 of the script.

[EdwinBernal1]

Issues Found

🟡 Service disruption risk on rescue VM

Script force-stops WSearch and WinDefend and does not restore service state at end. On long-lived rescue hosts this can leave host security/indexing degraded after script completion.

Recommendation: capture original service states and restore them in finally.

🟡 Success can be reported even when fallback copy-back fails

When hive copy fallback ($hiveCopy) is used, copy-back to original hive happens in finally. If copy-back fails, error is logged, but disk can still remain in $fixedDisks, and overall script may still return success.

Recommendation: mark per-disk status failed if copy-back fails and exclude from success list.