refactor(benchpress): added tsconfig to ts_library rules and awaited floating promises (#35147)

* Note: we specify our own tsconfig bc the default tsconfig we provide for ts_library disables the must-use-promises rule

PR Close #35147

modules/benchmarks/src/tree/tree_detect_changes.e2e-spec.ts

@@ -13,7 +13,7 @@ import {openTreeBenchmark} from './test_utils';
 describe('tree benchmark detect changes', () => {
   it('should work for detectChanges', async() => {
     openTreeBenchmark();
-    $('#detectChanges').click();
+    await $('#detectChanges').click();
     expect($('#numberOfChecks').getText()).toContain('10');
   });
 });