azuremonitor: increase memory for webpack build

The gigantic monaco dependency needs more memory so
it fails on CircleCI with the default memory allocation
of 2GB for a worker.

scripts/grunt/options/exec.js

@@ -1,4 +1,4 @@
-module.exports = function (config, grunt) {
+module.exports = function(config, grunt) {
   'use strict';
 
   return {
@@ -19,6 +19,7 @@ module.exports = function (config, grunt) {
       src: ['public/app/**/*.ts*'],
     },
     jest: 'node ./node_modules/jest-cli/bin/jest.js --maxWorkers 2',
-    webpack: 'node ./node_modules/webpack/bin/webpack.js --config scripts/webpack/webpack.prod.js',
+    webpack:
+      'node --max-old-space-size=4096 ./node_modules/webpack/bin/webpack.js --config scripts/webpack/webpack.prod.js',
   };
 };