test: remove bower and polymer benchmarks (#27931)

the polymer benchmarks are super old and not relevant any more

and these benchmarks were the only reason why we needed bower at all

so long, bower. thanks for all the fish.

PR Close #27931

modules/benchmarks_external/e2e_test/polymer_tree_perf.ts

@@ -1,37 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.io/license
- */
-
-import {runClickBenchmark, verifyNoBrowserErrors} from '@angular/testing/src/perf_util';
-
-describe('polymer tree benchmark', function() {
-
-  const URL = 'benchmarks_external/src/tree/polymer/index.html';
-
-  afterEach(verifyNoBrowserErrors);
-
-  it('should log the stats (create)', function(done) {
-    runClickBenchmark({
-      url: URL,
-      buttons: ['#destroyDom', '#createDom'],
-      id: 'polymer.tree.create',
-      params: [{name: 'depth', value: 9, scale: 'log2'}],
-      waitForAngular2: false
-    }).then(done, done.fail);
-  });
-
-  it('should log the stats (update)', function(done) {
-    runClickBenchmark({
-      url: URL,
-      buttons: ['#createDom'],
-      id: 'polymer.tree.update',
-      params: [{name: 'depth', value: 9, scale: 'log2'}],
-      waitForAngular2: false
-    }).then(done, done.fail);
-  });
-
-});