refactor(core): use ngOnDestroy in providers

Note about the addition of `beforeEach(fakeAsync(inject(…))))` in some tests:
`ApplicationRef` is now using `ngOnDestroy` and there is eager,
including all of its dependencies which contain `NgZone`.
The additional `fakeAsync` in `beforeEach` ensures that `NgZone`
uses the fake async zone as parent, and not the root zone.

BREAKING CHANGE (via deprecations):
- `ApplicationRef.dispose` is deprecated. Destroy the module that was
   created during bootstrap instead by calling `NgModuleRef.destroy`.
- `AplicationRef.registerDisposeListener` is deprecated.
   Use the `ngOnDestroy` lifecycle hook for providers or
   `NgModuleRef.onDestroy` instead.
- `disposePlatform` is deprecated. Use `destroyPlatform` instead.
- `PlatformRef.dipose()` is deprecated. Use `PlatformRef.destroy()`
   instead.
- `PlatformRef.registerDisposeListener` is deprecated. Use
  `PlatformRef.onDestroy` instead.
- `PlaformRef.diposed` is deprecated. Use `PlatformRef.destroyed`
  instead.

modules/@angular/compiler/test/runtime_compiler_spec.ts

@@ -39,7 +39,7 @@ export function main() {
     beforeEach(
         () => { TestBed.configureCompiler({providers: [{provide: XHR, useClass: SpyXHR}]}); });
 
-    beforeEach(inject(
+    beforeEach(fakeAsync(inject(
         [Compiler, TestComponentBuilder, XHR, DirectiveResolver, Injector],
         (_compiler: Compiler, _tcb: TestComponentBuilder, _xhr: SpyXHR,
          _dirResolver: MockDirectiveResolver, _injector: Injector) => {
@@ -48,7 +48,7 @@ export function main() {
           xhr = _xhr;
           dirResolver = _dirResolver;
           injector = _injector;
-        }));
+        })));
 
     describe('clearCacheFor', () => {
       it('should support changing the content of a template referenced via templateUrl',