Revert "feat: copilot frontend e2e (#7694)"

This reverts commit d71852789f.

tests/kit/utils/load-page.ts

@@ -1,11 +1,7 @@
 import type { Page } from '@playwright/test';
 import { expect } from '@playwright/test';
 
-export let coreUrl = 'http://localhost:8080';
-
-export function setCoreUrl(url: string) {
-  coreUrl = url;
-}
+export const coreUrl = 'http://localhost:8080';
 
 export async function openHomePage(page: Page) {
   await page.goto(coreUrl);