Fix v5 merge error (#7683)

Fixing an import I missed while merging to `msal-v5`, causing
PopupClient tests to break.

Author: jo-arroyo

lib/msal-browser/test/interaction_client/PopupClient.spec.ts

@@ -56,6 +56,7 @@ import {
     BrowserAuthError,
     createBrowserAuthError,
     BrowserAuthErrorMessages,
+    BrowserAuthErrorCodes,
 } from "../../src/error/BrowserAuthError.js";
 import { InteractionHandler } from "../../src/interaction_handler/InteractionHandler.js";
 import { getDefaultPerformanceClient } from "../utils/TelemetryUtils.js";