test(docs-infra): remove reflect-metadata polyfill from aio tests (an…

…gular#27130)

v7 CLI includes the polyfill automatically whenever JIT compiler is used, so we don't need
to do it explicitly.

PR Close angular#27130

aio/src/test.ts

@@ -1,9 +1,5 @@
 // This file is required by karma.conf.js and loads recursively all the .spec and framework files
 
-// Reflect.metadata polyfill is only needed in the JIT mode which we use only for unit tests
-import 'core-js/es6/reflect';
-import 'core-js/es7/reflect';
-
 import 'zone.js/dist/zone-testing';
 import { getTestBed } from '@angular/core/testing';
 import {