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/change_detection/differs/default_iterable_differ.ts

@@ -27,7 +27,8 @@ const trackByIdentity = (index: number, item: any) => item;
  */
 export class DefaultIterableDiffer<V> implements IterableDiffer<V>, IterableChanges<V> {
   public readonly length: number = 0;
-  public readonly collection: V[]|Iterable<V>|null;
+  // TODO(issue/24571): remove '!'.
+  public readonly collection !: V[] | Iterable<V>| null;
   // Keeps track of the used records at any point in time (during & across `_check()` calls)
   private _linkedRecords: _DuplicateMap<V>|null = null;
   // Keeps track of the removed records at any point in time during `_check()` calls.