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/forms/src/directives/ng_form.ts

@@ -93,7 +93,8 @@ export class NgForm extends ControlContainer implements Form,
    * ```
    *
    */
-  @Input('ngFormOptions') options: {updateOn?: FormHooks};
+  // TODO(issue/24571): remove '!'.
+  @Input('ngFormOptions') options !: {updateOn?: FormHooks};
 
   constructor(
       @Optional() @Self() @Inject(NG_VALIDATORS) validators: any[],