build: do not load tslib and moment twice in tests (angular#14715)

* SystemJS is responsible for loading `tslib` and `moment` as registered AMD modules. This means that we don't need to include them in Karma as well. Currently the browsers fetches Moment and tslib twice and also runs it without having any necessary effect.

test/karma.conf.js

@@ -15,7 +15,7 @@ module.exports = config => {
     ],
     files: [
       {pattern: 'node_modules/core-js/client/core.min.js', included: true, watched: false},
-      {pattern: 'node_modules/tslib/tslib.js', included: true, watched: false},
+      {pattern: 'node_modules/tslib/tslib.js', included: false, watched: false},
       {pattern: 'node_modules/systemjs/dist/system.js', included: true, watched: false},
       {pattern: 'node_modules/zone.js/dist/zone.min.js', included: true, watched: false},
       {pattern: 'node_modules/zone.js/dist/proxy.min.js', included: true, watched: false},
@@ -24,7 +24,7 @@ module.exports = config => {
       {pattern: 'node_modules/zone.js/dist/async-test.js', included: true, watched: false},
       {pattern: 'node_modules/zone.js/dist/fake-async-test.js', included: true, watched: false},
       {pattern: 'node_modules/hammerjs/hammer.min.js', included: true, watched: false},
-      {pattern: 'node_modules/moment/min/moment-with-locales.min.js', included: true, watched: false},
+      {pattern: 'node_modules/moment/min/moment-with-locales.min.js', included: false, watched: false},
 
       // Include all Angular dependencies
       {pattern: 'node_modules/@angular/**/*', included: false, watched: false},