test: Fix test for release branch (#11612)

Sadly, our release failed. The reason is that the lazy load integration
test loads the CDN bundle with the current version, which obv. does not
exist yet 😬 so we now properly mock this so this always passes.

Author: mydea

dev-packages/browser-integration-tests/suites/integrations/lazyLoad/validIntegration/test.ts

@@ -1,10 +1,19 @@
 import { expect } from '@playwright/test';
+import { SDK_VERSION } from '@sentry/browser';
 
 import { sentryTest } from '../../../../utils/fixtures';
 
 sentryTest('it allows to lazy load an integration', async ({ getLocalTestUrl, page }) => {
   const url = await getLocalTestUrl({ testDir: __dirname });
 
+  await page.route(`https://browser.sentry-cdn.com/${SDK_VERSION}/httpclient.min.js`, route => {
+    return route.fulfill({
+      status: 200,
+      contentType: 'application/javascript;',
+      body: "window.Sentry.httpClientIntegration = () => ({ name: 'HttpClient' })",
+    });
+  });
+
   await page.goto(url);
 
   const hasIntegration = await page.evaluate('!!window.Sentry.getClient()?.getIntegrationByName("HttpClient")');