refactor(configs): mark files inside @angular/core as using SystemJS style dynamic imports

Author: sis0k0

templates/webpack.angular.js

@@ -183,6 +183,13 @@ module.exports = env => {
                         { loader: "@ngtools/webpack", options: ngToolsWebpackOptions },
                     ]
                 },
+
+                // Mark files inside `@angular/core` as using SystemJS style dynamic imports.
+                // Removing this will cause deprecation warnings to appear.
+                {
+                    test: /[\/\\]@angular[\/\\]core[\/\\].+\.js$/,
+                    parser: { system: true },
+                },
             ],
         },
         plugins: [