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/core/src/render3/view_ref.ts

@@ -24,10 +24,12 @@ export interface viewEngine_ChangeDetectorRef_interface extends viewEngine_Chang
 
 export class ViewRef<T> implements viewEngine_EmbeddedViewRef<T>, viewEngine_InternalViewRef,
     viewEngine_ChangeDetectorRef_interface {
-  private _appRef: ApplicationRef|null;
+  // TODO(issue/24571): remove '!'.
+  private _appRef !: ApplicationRef | null;
 
   context: T;
-  rootNodes: any[];
+  // TODO(issue/24571): remove '!'.
+  rootNodes !: any[];
 
   constructor(protected _view: LViewData, context: T|null) { this.context = context !; }