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/linker/query_list.ts

@@ -42,8 +42,10 @@ export class QueryList<T>/* implements Iterable<T> */ {
   public readonly changes: Observable<any> = new EventEmitter();
 
   readonly length: number = 0;
-  readonly first: T;
-  readonly last: T;
+  // TODO(issue/24571): remove '!'.
+  readonly first !: T;
+  // TODO(issue/24571): remove '!'.
+  readonly last !: T;
 
   /**
    * See

packages/core/src/linker/system_js_ng_module_factory_loader.ts

@@ -28,12 +28,14 @@ export abstract class SystemJsNgModuleLoaderConfig {
   /**
    * Prefix to add when computing the name of the factory module for a given module name.
    */
-  factoryPathPrefix: string;
+  // TODO(issue/24571): remove '!'.
+  factoryPathPrefix !: string;
 
   /**
    * Suffix to add when computing the name of the factory module for a given module name.
    */
-  factoryPathSuffix: string;
+  // TODO(issue/24571): remove '!'.
+  factoryPathSuffix !: string;
 }
 
 const DEFAULT_CONFIG: SystemJsNgModuleLoaderConfig = {