test(aio): remove compileComponents from all tests

By reflex we began all component tests with an async `beforeEach` that called `compileComponents`.
In at least one case (`live-example.component.spec.ts`) that led to the `it` tests being async as well.
There is no need to call `.compileComponents` because CLI web pack + plugin inlines all templates and styles.
While `.compileComponents` was harmless, it added complexity and distraction which we should not inflict on future readers and testers.

aio/src/app/layout/doc-viewer/doc-viewer.component.spec.ts

@@ -112,7 +112,7 @@ describe('DocViewerComponent', () => {
     component.currentDoc = { contents, id };
   }
 
-  beforeEach(async(() => {
+  beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [ TestModule ],
       declarations: [
@@ -125,9 +125,8 @@ describe('DocViewerComponent', () => {
         { provide: Title, useClass: TestTitleService },
         { provide: TocService, useClass: TestTocService }
       ]
-    })
-    .compileComponents();
-  }));
+    });
+  });
 
   beforeEach(() => {
     fixture = TestBed.createComponent(TestComponent);