test: disambiguate e2e and perf spec files (#34753)

Currently, based on the file names it's not quite clear whether
a given `.spec.ts` file runs benchmark perf or benchmark e2e
functionality tests. To disambiguate these, we use new file
suffixs. i.e. `e2e-spec.ts` and `perf-spec.ts`.

PR Close #34753

modules/benchmarks/src/expanding_rows/expanding_rows.perf-spec.ts

@@ -0,0 +1,26 @@
+/**
+ * @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 {$, browser} from 'protractor';
+import {runBenchmark} from '../../../e2e_util/perf_util';
+
+describe('benchmarks', () => {
+
+  it('should work for create', done => {
+    browser.rootEl = '#root';
+    runBenchmark({
+      id: 'create',
+      url: '',
+      ignoreBrowserSynchronization: true,
+      params: [],
+      prepare: () => $('#reset').click(),
+      work: () => $('#init').click()
+    }).then(done, done.fail);
+  });
+
+});