[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/toolsets/toolset-1804.json

@@ -280,5 +280,47 @@
             "8.0"
         ]
     },
-    "rubygems": []
+    "rubygems": [],
+    "node_modules": [
+        {
+            "name": "grunt",
+            "command": "grunt"
+        },
+        {
+            "name": "gulp",
+            "command": "gulp"
+        },
+        {
+            "name": "n",
+            "command": "n"
+        },
+        {
+            "name": "parcel-bundler",
+            "command": "parcel"
+        },
+        {
+            "name": "typescript",
+            "command": "tsc"
+        },
+        {
+            "name": "newman",
+            "command": "newman"
+        },
+        {
+            "name": "vercel",
+            "command": "vercel"
+        },
+        {
+            "name": "webpack",
+            "command": "webpack"
+        },
+        {
+            "name": "webpack-cli",
+            "command": "webpack-cli"
+        },
+        {
+            "name": "netlify-cli",
+            "command": "netlify"
+        }
+    ]
 }