[macos] suppress xcodebuild output (#8276)

Author: ilia-shipitsin

images/macos/helpers/Xcode.Installer.psm1

@@ -176,7 +176,7 @@ function Install-AdditionalSimulatorRuntimes {
 
     Write-Host "Installing Simulator Runtimes for Xcode $Version ..."
     $xcodebuildPath = Get-XcodeToolPath -Version $Version -ToolName "xcodebuild"
-    Invoke-ValidateCommand "$xcodebuildPath -downloadAllPlatforms"
+    Invoke-ValidateCommand "$xcodebuildPath -downloadAllPlatforms" | Out-Null
 }
 
 function Build-XcodeSymlinks {

images/macos/provision/core/xcode.ps1

@@ -41,7 +41,7 @@ $xcodeVersions | ForEach-Object {
     ForEach($runtime in $_.runtimes) {
         Write-Host "Installing Additional runtimes for Xcode '$runtime' ..."
         $xcodebuildPath = Get-XcodeToolPath -Version $_.link -ToolName 'xcodebuild'
-        Invoke-ValidateCommand "sudo $xcodebuildPath -downloadPlatform $runtime"
+        Invoke-ValidateCommand "sudo $xcodebuildPath -downloadPlatform $runtime" | Out-Null
     }
 
 }