refactor(common): ensure compatibility with typescript strict flag (#30993)

As part of FW-1265, the `@angular/common` package is made compatible
with the TypeScript `--strict` flag. Read more about the strict flag [here](https://www.typescriptlang.org/docs/handbook/compiler-options.html)

PR Close #30993

packages/common/http/src/xhr.ts

@@ -231,7 +231,7 @@ export class HttpXhrBackend implements HttpBackend {
       // The onError callback is called when something goes wrong at the network level.
       // Connection timeout, DNS error, offline, etc. These are actual errors, and are
       // transmitted on the error channel.
-      const onError = (error: ErrorEvent) => {
+      const onError = (error: ProgressEvent) => {
         const {url} = partialFromXhr();
         const res = new HttpErrorResponse({
           error,