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/platform-server/src/http.ts

@@ -114,7 +114,8 @@ export abstract class ZoneMacroTaskWrapper<S, R> {
 export class ZoneMacroTaskConnection extends ZoneMacroTaskWrapper<Request, Response> implements
     Connection {
   response: Observable<Response>;
-  lastConnection: Connection;
+  // TODO(issue/24571): remove '!'.
+  lastConnection !: Connection;
 
   constructor(public request: Request, private backend: XHRBackend) {
     super();