Sync eng/common directory with azure-sdk-tools for PR 12267 (#6758)

* Use authenticated GitHub request when env variable is present

eng/common/scripts/Helpers/AzSdkTool-Helpers.ps1

@@ -105,6 +105,39 @@ function isNewVersion(
     return $true
 }
 
+function Get-GitHubApiHeaders {
+    # Use GitHub cli to get an auth token if available
+    $token = ""
+    if (Get-Command gh -ErrorAction SilentlyContinue) {
+        try
+        {
+            $token = gh auth token 2>$null
+        }
+        catch
+        {
+            Write-Host "Failed to get GitHub CLI auth token."
+        }
+    }
+
+    # Get token from env if not available from gh cli
+    if (!$token)
+    {
+        Write-Host "Checking for GITHUB_TOKEN environment variable."
+        $token = $env:GITHUB_TOKEN
+    }
+
+    if ($token)
+    {
+        Write-Host "Using authenticated GitHub API requests."
+        $headers = @{
+            Authorization = "Bearer $token"
+        }
+        return $headers
+    }
+    Write-Host "Using unauthenticated GitHub API requests."
+    return @{}
+}
+
 <#
 .SYNOPSIS
 Installs a standalone version of an engsys tool.
@@ -135,11 +168,12 @@ function Install-Standalone-Tool (
     }
 
     $tag = "${Package}_${Version}"
+    $headers = Get-GitHubApiHeaders
 
     if (!$Version -or $Version -eq "*") {
         Write-Host "Attempting to find latest version for package '$Package'"
         $releasesUrl = "https://api.github.com/repos/$Repository/releases"
-        $releases = Invoke-RestMethod -Uri $releasesUrl
+        $releases = Invoke-RestMethod -Uri $releasesUrl -Headers $headers
         $found = $false
         foreach ($release in $releases) {
             if ($release.tag_name -like "$Package*") {
@@ -163,7 +197,7 @@ function Install-Standalone-Tool (
 
     if (isNewVersion $version $downloadFolder) {
         Write-Host "Installing '$Package' '$Version' to '$downloadFolder' from $downloadUrl"
-        Invoke-WebRequest -Uri $downloadUrl -OutFile $downloadLocation
+        Invoke-WebRequest -Uri $downloadUrl -OutFile $downloadLocation -Headers $headers
 
         if ($downloadFile -like "*.zip") {
             Expand-Archive -Path $downloadLocation -DestinationPath $downloadFolder -Force