Improves ADK FWLink resolution for robustness

Refactors the ADK URL retrieval logic to let `Invoke-WebRequest` handle the forward link redirection directly. This approach is more reliable than manually parsing the redirect response.

Adds a try/catch block to provide better error handling and logging during the URL resolution process.

FFUDevelopment/BuildFFUVM.ps1

@@ -1648,21 +1648,30 @@ function Get-ADKURL {
             return
         }
 
-        # Retrieve headers of the FWlink URL
+        # Let Invoke-WebRequest handle the redirect and get the final URL.
+        try {
             $OriginalVerbosePreference = $VerbosePreference
             $VerbosePreference = 'SilentlyContinue'
-        $FWLinkRequest = Invoke-WebRequest -Uri $ADKFWLink -Method Head -MaximumRedirection 0 -ErrorAction SilentlyContinue
+            # Allow one redirection to get the final URL from the fwlink
+            $response = Invoke-WebRequest -Uri $ADKFWLink -Method Head -MaximumRedirection 1 -Headers $Headers -UserAgent $UserAgent
             $VerbosePreference = $OriginalVerbosePreference
             
-        if ($FWLinkRequest.StatusCode -ne 302) {
+            # The final URL after redirection is in the ResponseUri property of the BaseResponse's RequestMessage.
-            WriteLog "Failed to retrieve ADK download URL. Unexpected status code: $($FWLinkRequest.StatusCode)"
+            $ADKUrl = $response.BaseResponse.RequestMessage.RequestUri.AbsoluteUri
-            return
+            
+            if ($null -eq $ADKUrl) {
+                 WriteLog "Could not determine final ADK download URL after redirection."
+                 return $null
             }
             
-        # Get the ADK link redirected to by the FWlink
+            WriteLog "Resolved ADK download URL to: $ADKUrl"
-        $ADKUrl = $FWLinkRequest.Headers.Location
             return $ADKUrl
         }
+        catch {
+             WriteLog "An error occurred while resolving the ADK FWLink: $($_.Exception.Message)"
+             throw
+        }
+    }
     catch {
         WriteLog $_
         Write-Error "Error occurred while retrieving ADK download URL"