fix: make angular client error response type optional

Author: pullfrog[bot]

packages/openapi-ts/src/plugins/@hey-api/client-angular/bundle/types.ts

@@ -132,7 +132,8 @@ export type RequestResult<
               error: TError[keyof TError];
               /** request may be undefined, because error may be from building the request object itself */
               request?: HttpRequest<unknown>;
-              response: HttpErrorResponse & {
+              /** response may be undefined, because error may be from building the request object itself or from a network error */
+              response?: HttpErrorResponse & {
                 error: TError[keyof TError] | null;
               };
             }