build(bazel): Turning on strictPropertyInitialization for Angular. (#24572)

All errors for existing fields have been detected and suppressed with a
`!` assertion.

Issue/24571 is tracking proper clean up of those instances.

One-line change required in ivy/compilation.ts, because it appears that
the new syntax causes tsickle emitted node to no longer track their
original sourceFiles.

PR Close #24572

packages/compiler/test/integration_spec.ts

@@ -20,7 +20,8 @@ import {expect} from '@angular/platform-browser/testing/src/matchers';
       it('should support dotted selectors', async(() => {
            @Directive({selector: '[dot.name]'})
            class MyDir {
-             @Input('dot.name') value: string;
+             // TODO(issue/24571): remove '!'.
+             @Input('dot.name') value !: string;
            }
 
            TestBed.configureTestingModule({