Add persistent input validation logging

[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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File	Status	Preview URL	Details
	❌Error		Details

• 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.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[learn-build-service-prod]

Learn Build status updates of commit cf58078:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• Line 0, Column 0: [Error: PSMD2Yaml_FileLoadFailed] Failed to load file: C:/LocalRun/W/i5fi-s/module/mapping/monikerMapping.json. PackageRoot, ReferenceTocUrl, and ConceptualTocUrl are required for every moniker. PackageRoot should be a valid relative path to docset root.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[learn-build-service-prod]

Learn Build status updates of commit 8e20ceb:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• Line 0, Column 0: [Error: PSMD2Yaml_FileLoadFailed] Failed to load file: C:/LocalRun/W/1mcr-s/module/mapping/monikerMapping.json. PackageRoot, ReferenceTocUrl, and ConceptualTocUrl are required for every moniker. PackageRoot should be a valid relative path to docset root.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.