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/common/http/src/response.ts

@@ -171,7 +171,8 @@ export abstract class HttpResponseBase {
   /**
    * Type of the response, narrowed to either the full response or the header.
    */
-  readonly type: HttpEventType.Response|HttpEventType.ResponseHeader;
+  // TODO(issue/24571): remove '!'.
+  readonly type !: HttpEventType.Response | HttpEventType.ResponseHeader;
 
   /**
    * Super-constructor for all responses.