[windows] Add windows-11-arm64 image generation code (#13879)

images/windows/scripts/build/Install-PowershellCore.ps1

@@ -6,6 +6,12 @@
 
 $ErrorActionPreference = "Stop"
 
+if (Test-IsArm64) {
+    $pwshArch = "arm64"
+} else {
+    $pwshArch = "x64"
+}
+
 $tempDir = Join-Path ([System.IO.Path]::GetTempPath()) ([System.IO.Path]::GetRandomFileName())
 New-Item -ItemType Directory -Path $tempDir -Force -ErrorAction SilentlyContinue | Out-Null
 try {
@@ -18,7 +24,7 @@ try {
     $releases = $metadata.LTSReleaseTag -replace '^v'
     foreach ($release in $releases) {
         if ($release -like "${pwshMajorMinor}*") {
-            $downloadUrl = "https://github.com/PowerShell/PowerShell/releases/download/v${release}/PowerShell-${release}-win-x64.msi"
+            $downloadUrl = "https://github.com/PowerShell/PowerShell/releases/download/v${release}/PowerShell-${release}-win-${pwshArch}.msi"
             break
         }
     }