Parallel installation of Xcode (#2432)

* parallel xcode installation

* resolve comments

* fix changes

* resolve comments and change ErrorActionPreference

* return imports

* switch ErrorActionPreference to Stop

* add log for threadCount

* add errorAction

* use new approach for warning

* change to bash -c

* change approach to install xcodes through to parallel foreach

* use & bash -c "command"

* mv upper ErrorActionPreference and work on logs

* mv $env:SPACESHIP_SKIP_2FA_UPGRADE = 1

* change process count to 5

* Invoke-XCVersion add out-host

images/macos/provision/core/xcode.ps1

@@ -18,9 +18,14 @@ $os = Get-OSVersion
 $xcodeVersions = Get-ToolsetValue "xcode.versions"
 $defaultXcode = Get-ToolsetValue "xcode.default"
 [Array]::Reverse($xcodeVersions)
+$threadCount = "5"
 
 Write-Host "Installing Xcode versions..."
-$xcodeVersions | ForEach-Object {
+$xcodeVersions | ForEach-Object -ThrottleLimit $threadCount -Parallel {
+    $ErrorActionPreference = "Stop"
+    Import-Module "$env:HOME/image-generation/helpers/Common.Helpers.psm1"
+    Import-Module "$env:HOME/image-generation/helpers/Xcode.Installer.psm1"
+
     Install-XcodeVersion -Version $_.version -LinkTo $_.link
     Confirm-XcodeIntegrity -Version $_.link
     Approve-XcodeLicense -Version $_.link
@@ -31,7 +36,9 @@ if ($os.IsLessThanCatalina) {
     $latestXcodeVersion = $xcodeVersions | Select-Object -Last 1 -ExpandProperty link
     Install-XcodeAdditionalPackages -Version $latestXcodeVersion
 }
-$xcodeVersions | ForEach-Object { Invoke-XcodeRunFirstLaunch -Version $_.link }
+$xcodeVersions | ForEach-Object { 
+    Invoke-XcodeRunFirstLaunch -Version $_.link 
+}
 Invoke-XcodeRunFirstLaunch -Version $defaultXcode
 
 Write-Host "Configuring Xcode symlinks..."