test: add systemjs+umd integration test (#14196)

This test ensures the `__esModule` is set on UMD bundles, thus making them compatible with SystemJS@^0.22.3.

Followup from https://github.com/frankwallis/plugin-typescript/issues/185.

PR Close #14196

packages/upgrade/rollup.config.js

@@ -10,6 +10,7 @@ export default {
   entry: '../../dist/packages-dist/upgrade/@angular/upgrade.es5.js',
   dest: '../../dist/packages-dist/upgrade/bundles/upgrade.umd.js',
   format: 'umd',
+  exports: 'named',
   moduleName: 'ng.upgrade',
   globals: {
     '@angular/core': 'ng.core',

packages/upgrade/static/rollup.config.js

@@ -10,6 +10,7 @@ export default {
   entry: '../../../dist/packages-dist/upgrade/@angular/upgrade/static.es5.js',
   dest: '../../../dist/packages-dist/upgrade/bundles/upgrade-static.umd.js',
   format: 'umd',
+  exports: 'named',
   moduleName: 'ng.upgrade.static',
   globals: {'@angular/core': 'ng.core'}
 };