refactor(scripts): optimize system remediation and M365 export scripts

- teams: harden Classic Teams removal, protect New Teams, and clean HKU run keys
- dotnet: add bootstrapper EXE uninstall support and remove orphaned 3.1.* folders
- teams: add MSIX package targeting and version parsing for vulnerable New Teams builds
- m365: improve Graph SDK export speed, reuse sessions, and add null-safe handling

scripts/Remove-DotNetCore31.ps1

@@ -0,0 +1,120 @@
+#Requires -RunAsAdministrator
+
+<#
+.SYNOPSIS
+    Removes unsupported Microsoft .NET Core / ASP.NET Core / Windows Desktop Runtime / SDK 3.1.x components.
+.DESCRIPTION
+    Queries HKLM uninstall registry locations (64-bit and 32-bit) for .NET 3.1.x components,
+    executes quiet uninstallation for both MSI and Executable/Bundle bootstrappers,
+    cleans orphaned runtime directories, and verifies removal.
+#>
+
+$ErrorActionPreference = "Continue"
+
+Write-Host "Starting .NET Core 3.1 remediation..." -ForegroundColor Cyan
+
+$registryPaths = @(
+    "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*",
+    "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*"
+)
+
+# Search pattern targeting 3.1.x runtimes, SDKs, targeting packs, and hosting bundles
+$targetApps = foreach ($path in$registryPaths) {
+    Get-ItemProperty $path -ErrorAction SilentlyContinue | Where-Object {
+        (
+            $_.DisplayName -match "Microsoft .*\b3\.1\.\d+\b" -or
+            $_.DisplayName -match "Microsoft \.NET (Core|SDK|Runtime|Windows Desktop|ASP\.NET Core).*3\.1"
+        ) -and ($_.UninstallString -or$_.QuietUninstallString)
+    }
+}
+
+if (-not $targetApps) {
+    Write-Host "No .NET Core 3.1 components found. System is clean." -ForegroundColor Green
+    exit 0
+}
+
+Write-Host "Found $($targetApps.Count) .NET Core 3.1 component(s) to remove:" -ForegroundColor Yellow
+foreach ($app in$targetApps) {
+    Write-Host " - $($app.DisplayName) ($($app.DisplayVersion))" -ForegroundColor Yellow
+}
+
+foreach ($app in$targetApps) {
+    Write-Host "`nAttempting to remove: $($app.DisplayName)..." -ForegroundColor Cyan
+
+    $uninstallCmd = if ($app.QuietUninstallString) { $app.QuietUninstallString } else { $app.UninstallString }
+
+    if ($uninstallCmd -match "\{[A-Fa-f0-9\-]{36}\}") {
+        # Standard MSI Uninstall
+        $productCode = $Matches[0]
+        Write-Host "Executing MSI uninstall for GUID: $productCode" -ForegroundColor Gray
+        $proc = Start-Process -FilePath "msiexec.exe" -ArgumentList "/x $productCode /qn /norestart" -Wait -PassThru -NoNewWindow
+    }
+    else {
+        # Executable / WiX Burn Bootstrapper Uninstall
+        Write-Host "Executing Bootstrapper EXE uninstall..." -ForegroundColor Gray
+        
+        # Parse EXE path and arguments safely
+        if ($uninstallCmd -match '^"([^"]+)"(.*)$') {
+            $exePath = $Matches[1]
+            $exeArgs = "$($Matches[2]) /uninstall /quiet /norestart".Trim()
+        }
+        elseif ($uninstallCmd -match '^(\S+)(.*)$') {
+            $exePath = $Matches[1]
+            $exeArgs = "$($Matches[2]) /uninstall /quiet /norestart".Trim()
+        }
+        else {
+            $exePath = $uninstallCmd
+            $exeArgs = "/uninstall /quiet /norestart"
+        }
+
+        $proc = Start-Process -FilePath $exePath -ArgumentList $exeArgs -Wait -PassThru -NoNewWindow -ErrorAction SilentlyContinue
+    }
+
+    # Evaluate return codes (0 = Success, 3010 = Success, reboot required)
+    if ($proc.ExitCode -in @(0, 3010)) {
+        Write-Host "Successfully processed uninstall for $($app.DisplayName)." -ForegroundColor Green
+    } else {
+        Write-Host "Warning: Uninstall process returned exit code $($proc.ExitCode) for $($app.DisplayName)." -ForegroundColor Yellow
+    }
+}
+
+# Clean residual 3.1.x folder remnants from dotnet installation directories
+$dotnetPaths = @(
+    "$env:ProgramFiles\dotnet",
+    "${env:ProgramFiles(x86)}\dotnet"
+)
+
+foreach ($basePath in $dotnetPaths) {
+    if (Test-Path $basePath) {
+        Get-ChildItem -Path $basePath -Recurse -Directory -ErrorAction SilentlyContinue | Where-Object {
+            $_.Name -like "3.1.*"
+        } | ForEach-Object {
+            Write-Host "Removing leftover directory: $($_.FullName)" -ForegroundColor Yellow
+            Remove-Item -Path $_.FullName -Recurse -Force -ErrorAction SilentlyContinue
+        }
+    }
+}
+
+# Final Verification
+Write-Host "`nVerifying remaining .NET Core 3.1 components..." -ForegroundColor Cyan
+
+$remainingApps = foreach ($path in$registryPaths) {
+    Get-ItemProperty $path -ErrorAction SilentlyContinue | Where-Object {
+        (
+            $_.DisplayName -match "Microsoft .*\b3\.1\.\d+\b" -or
+            $_.DisplayName -match "Microsoft \.NET (Core|SDK|Runtime|Windows Desktop|ASP\.NET Core).*3\.1"
+        ) -and ($_.UninstallString -or$_.QuietUninstallString)
+    }
+}
+
+if ($remainingApps) {
+    Write-Host "ERROR: Some .NET Core 3.1 components remain installed:" -ForegroundColor Red
+    $remainingApps | ForEach-Object {
+        Write-Host " - $($_.DisplayName) ($($_.DisplayVersion))" -ForegroundColor Red
+    }
+    exit 1
+}
+else {
+    Write-Host ".NET Core 3.1 remediation completed successfully." -ForegroundColor Green
+    exit 0
+}