Include identical helix script files directly (#23116)

eng/helix/content/Download.ps1

@@ -1,47 +0,0 @@
- <# 
- .SYNOPSIS 
-     Downloads a given URI and saves it to outputFile
- .DESCRIPTION
-     Downloads a given URI and saves it to outputFile
- PARAMETER uri
-    The URI to fetch
-.PARAMETER outputFile
-    The outputh file path to save the URI
-#>
-param(
-    [Parameter(Mandatory = $true)]
-    $uri,
-
-    [Parameter(Mandatory = $true)]
-    $outputFile
-)
-[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
-$ProgressPreference = 'SilentlyContinue' # Don't display the console progress UI - it's a huge perf hit
-
-$maxRetries = 5
-$retries = 1
-
-while($true) {
-    try {
-      Write-Host "GET $uri"
-      Invoke-WebRequest $uri -OutFile $outputFile
-      break
-    }
-    catch {
-      Write-Host "Failed to download '$uri'"
-      $error = $_.Exception.Message
-    }
-
-    if (++$retries -le $maxRetries) {
-      Write-Warning $error -ErrorAction Continue
-      $delayInSeconds = [math]::Pow(2, $retries) - 1 # Exponential backoff
-      Write-Host "Retrying. Waiting for $delayInSeconds seconds before next attempt ($retries of $maxRetries)."
-      Start-Sleep -Seconds $delayInSeconds
-    }
-    else {
-      Write-Error $error -ErrorAction Continue
-      throw "Unable to download file in $maxRetries attempts."
-    }
- }
-
-Write-Host "Download of '$uri' complete, saved to $outputFile..."

eng/targets/Helix.targets

@@ -27,6 +27,7 @@
   <!-- Item group has to be defined here becasue Helix.props is evaluated before xunit.runner.console.props  -->
   <ItemGroup Condition="$(BuildHelixPayload)">
     <Content Include="@(HelixContent)" />
+    <Content Include="$(RepoRoot)eng\scripts\Download.ps1" />
   </ItemGroup>
 
 <!--