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/platform-server/test/integration_spec.ts

@@ -250,7 +250,8 @@ class NativeExampleModule {
 
 @Component({selector: 'my-child', template: 'Works!'})
 class MyChildComponent {
-  @Input() public attr: boolean;
+  // TODO(issue/24571): remove '!'.
+  @Input() public attr !: boolean;
 }
 
 @Component({selector: 'app', template: '<my-child [attr]="false"></my-child>'})