Dynamically collect all MdmDiagnosticsTool areas from registry (fixes #16)

[YeehomZhu]

Summary

Fixes #16 - Expand parameters for MDMDIAGNOSTICSTOOL.EXE

Changes

Replaced the static MdmDiagnosticsTool.exe -out $pwd command with dynamic registry-based area collection that:

1. Reads all available diagnostic areas from HKLM:\SOFTWARE\Microsoft\MdmDiagnostics\Area
2. Joins them into a semicolon-delimited string (e.g., Autopilot;DeviceEnrollment;DeviceProvisioning;OsConfiguration;TPM)
3. Runs MdmDiagnosticsTool.exe -area "<all areas>" -zip to produce a comprehensive MDMDiagReport-AllAreas.zip
4. Falls back to the original behavior if the registry key doesn't exist or has no areas

Why

Previously, ODC only ran the default MdmDiagnosticsTool.exe -out which missed areas like TPM and DeviceProvisioningService. Support engineers had to manually run additional cab collections. This change automatically discovers and includes all registered areas.

Testing

• Verified registry key HKLM:\SOFTWARE\Microsoft\MdmDiagnostics\Area returns 5 areas: Autopilot, DeviceEnrollment, DeviceProvisioning, OsConfiguration, TPM
• Unit tested: produced 18.5MB MDMDiagReport-AllAreas.zip with all areas
• Full end-to-end ODC test: zero errors, both Autopilot-specific and AllAreas ZIPs created successfully
• Output location: Commands\General\MDMDiagReport-AllAreas.zip