Add persistent input validation logging (Microsoft.Security.SystemsADM.10031)

[KenitoInc]

Summary

Adds persistent logging of input validation failures to satisfy compliance requirement.

Problem

Validation failures were only displayed to the user via Write-Warning/Write-Error/throw without being persisted for security audit purposes.

Solution

Created Write-EntraInputValidationLog function that:

• Writes structured log entries to %LOCALAPPDATA%/Microsoft.Entra/Logs/InputValidation-{date}.log
• On Windows: also writes to Windows Event Log (Application, source 'Microsoft.Entra', EventId 1001)
• On Linux/macOS: also writes to syslog via logger command
• Masks sensitive values (first 4 chars + **** for values >8 chars)
• Is non-fatal — logging failures never block cmdlet execution

Changes

• 9 new files: Write-EntraInputValidationLog.ps1 in each submodule folder (5 Entra + 4 EntraBeta)
• 23 modified cmdlets: Added logging calls at all validation failure points
• 5 test files: 15 unit tests + 8 integration tests (23 total, all passing)

Cross-platform

• Uses [System.Environment]::UserName on non-Windows (instead of WindowsIdentity)
• Syslog fallback on Linux/macOS instead of Windows Event Log
• File logging path uses [Environment]::GetFolderPath('LocalApplicationData') (works on all platforms)

Testing

• Build: ✅ passes
• Tests: ✅ 23/23 pass
• No regressions in existing tests

[learn-build-service-prod]

Learn Build status updates of commit e4d0bd2:

❌ Validation status: errors

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• Line 0, Column 0: [Error: PSMD2Yaml_FileLoadFailed] Failed to load file: C:/LocalRun/W/5gyz-s/module/mapping/monikerMapping.json. PackageRoot, ReferenceTocUrl, and ConceptualTocUrl are required for every moniker. PackageRoot should be a valid relative path to docset root.

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