Fix front-end unit tests (#2529)

This doesn't really add any tests, and we'll require many more additions
if we actually want to have full unit testing, but this at least makes
the tests pass when running `npm test`.

console-webapp/karma.conf.js

@@ -3,6 +3,17 @@
 
 module.exports = function (config) {
   config.set({
+    customLaunchers: {
+      ChromeHeadless: {
+        base: 'Chrome',
+        flags: [
+          '--no-sandbox',
+          '--disable-gpu',
+          '--headless',
+          '--remote-debugging-port=9222'
+        ]
+      }
+    },
     basePath: '',
     frameworks: ['jasmine', '@angular-devkit/build-angular'],
     plugins: [