[macOS] Activate "Allow Remote Automation" Safari option during image generation (#3996)

* Move logic to activate "Allow Remote Automation" from base image to image gen scripts

* add shebang

images/macos/tests/Browsers.Tests.ps1

@@ -31,4 +31,15 @@ Describe "Firefox" {
     It "Geckodriver" {
         "geckodriver --version" | Should -ReturnZeroExitCode
     }
+}
+
+Describe "Safari" {
+    It "'Allow Remote Automation' option is activated" {
+        $plistPath = "$env:HOME/Library/WebDriver/com.apple.Safari.plist"
+        $command = "/usr/libexec/PlistBuddy -c 'print AllowRemoteAutomation' $plistPath"
+        $plistPath | Should -Exist
+        $commandResult = Get-CommandResult $command
+        $commandResult.ExitCode | Should -Be 0
+        $commandResult.Output | Should -Be "true"
+    }
 }