[ubuntu] Add lerna (#2763)

* Add lerna to linux images

* Add a comment about netlify-cli

* remove Node.js tests from Tools.Tests.ps1

* fix tabs

* revert empty lines

* fix code style

images/linux/scripts/tests/Node.Tests.ps1

@@ -0,0 +1,14 @@
+Describe "Node.js" {
+    $binaries = @("node")
+    $module_commands = (Get-ToolsetContent).node_modules | ForEach-Object { $_.command }
+    $testCases = $binaries + $module_commands | ForEach-Object { @{NodeCommand = $_} }
+
+    It "<NodeCommand>" -TestCases $testCases {
+        param (
+            [string] $NodeCommand
+        )
+
+        "$NodeCommand --version" | Should -ReturnZeroExitCode
+    }
+}
+