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/i18n/integration_common.ts

@@ -19,9 +19,12 @@ import {expect} from '@angular/platform-browser/testing/src/matchers';
   template: '',
 })
 export class I18nComponent {
-  count: number;
-  sex: string;
-  sexB: string;
+  // TODO(issue/24571): remove '!'.
+  count !: number;
+  // TODO(issue/24571): remove '!'.
+  sex !: string;
+  // TODO(issue/24571): remove '!'.
+  sexB !: string;
   response: any = {getItemsList: (): any[] => []};
 }