Hide output from register/unregister ps module repository

Author: benbp

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

@@ -79,7 +79,7 @@ function installModule([string]$moduleName, [string]$version, $repoUrl) {
   $repo = (Get-PSRepository).Where({ $_.SourceLocation -eq $repoUrl })
   if ($repo.Count -eq 0)
   {
-    Register-PSRepository -Name $repoUrl -SourceLocation $repoUrl -InstallationPolicy Trusted
+    Register-PSRepository -Name $repoUrl -SourceLocation $repoUrl -InstallationPolicy Trusted | Out-Null
     $repo = (Get-PSRepository).Where({ $_.SourceLocation -eq $repoUrl })
     if ($repo.Count -eq 0) {
       throw "Failed to register package repository $repoUrl."
@@ -104,7 +104,7 @@ function installModule([string]$moduleName, [string]$version, $repoUrl) {
 
   # Unregister repository as it can cause overlap issues with `dotnet tool install`
   # commands using the same devops feed
-  Unregister-PSRepository -Name $repoUrl
+  Unregister-PSRepository -Name $repoUrl | Out-Null
 
   return $modules[0]
 }