add separation of msw handlers into browser and e2e contexts, and replace the import.meta statements into the browser file since only the browser can handle esmodules

src/Umbraco.Web.UI.Client/test.ts

@@ -1,7 +1,7 @@
 import { expect, test as base } from '@playwright/test';
 import { createWorkerFixture } from 'playwright-msw';
 
-import { handlers } from './src/mocks/handlers';
+import { handlers } from './src/mocks/e2e-handlers';
 
 import type { MockServiceWorker } from 'playwright-msw';
 const test = base.extend<{