[macos] introduce more flexible way of managind xcode runtimes (#8572)

images/macos/provision/core/xcode.ps1

@@ -29,7 +29,7 @@ $xcodeVersions | ForEach-Object {
     Write-Host "Configuring Xcode $($_.link) ..."
     Invoke-XcodeRunFirstLaunch -Version $_.link
 
-    if ($_.link.Split(".")[0] -ge 14) {
+    if ($_.install_runtimes -eq 'true') {
         # Additional simulator runtimes are included by default for Xcode < 14
         Install-AdditionalSimulatorRuntimes -Version $_.link
     }