Update frontend build tasks and fix test execution not working issue.

Author: yohangz

project/FrontendCommands.scala

@@ -4,7 +4,7 @@
   */
 object FrontendCommands {
   val dependencyInstall: String = "npm install"
-  val test: String = "npm run test-no-watch"
+  val test: String = "npm run test:ci"
   val serve: String = "npm run start"
-  val build: String = "npm run build-prod"
+  val build: String = "npm run build:prod"
 }

ui/package.json

@@ -4,14 +4,15 @@
   "license": "MIT",
   "scripts": {
     "ng": "ng",
-    "build": "ng build",
-    "test": "ng test",
     "lint": "ng lint",
     "e2e": "ng e2e",
     "start": "ng serve --open --proxy-config src/proxy.conf.js --host 0.0.0.0",
-    "test-no-watch": "ng test --single-run",
-    "build-dev": "ng build --progress --output-path ../public",
-    "build-prod": "ng build --extract-css --progress --prod --aot --output-path ../public"
+    "test": "ng test --watch",
+    "test:ci": "ng test --watch=false --browsers ChromeHeadless",
+    "test:coverage": "ng test --watch=true --code-coverage=true",
+    "test:coverage:ci": "ng test --watch=false --code-coverage=true --browsers ChromeHeadless",
+    "build:dev": "ng build --progress --output-path ../public",
+    "build:prod": "ng build --progress --prod --output-path ../public"
   },
   "private": true,
   "dependencies": {