feat: Linux and additional VM configuration support

[kristopherjturner]

Overview

Extend conversion script support to Linux VMs and additional Windows VM configurations that are not currently handled (e.g., dynamic disks, VMs with multiple data disks, VMs with IDE-attached disks).

Scope

Linux support:

• Ubuntu 20.04/22.04 and RHEL 8/9 Gen1 → Gen2 conversion
• GRUB configuration update for UEFI boot
• Linux partition layout awareness (GPT + EFI system partition creation)

Additional Windows configurations:

• VMs with multiple data disks (>1 disk)
• VMs with IDE-attached disks (requires SCSI migration before Gen2)
• Dynamic VHD detection and handling

Acceptance Criteria

• Ubuntu 20.04/22.04 Gen1 → Gen2 conversion completes successfully
• RHEL 8/9 Gen1 → Gen2 conversion completes successfully
• Multi-disk VMs handled correctly (system disk identified, data disks preserved)
• IDE disk detection and SCSI migration handled pre-conversion
• Pester/Bash test coverage for Linux conversion path

Dependencies

• Parent Epic: [Epic] VM Conversion Toolkit Full Build-Out #5
• Azure Local path scripts: feat: script refinement — Azure Local conversion path (01–05 scripts) #6
• Hyper-V path scripts: feat: script refinement — Hyper-V standalone conversion path #7

Priority Note

Priority/medium — Linux and edge-case support deferred until core Windows path is stable.