Tests: Playwright test timeouts (#7231)

## Summary

See where we can use proper DOM waiting instead of waitForTimeout.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7231-WIP-Playwright-test-timeouts-2c36d73d3650812b966ac3d9c338dfd4)
by [Unito](https://www.unito.io)

browser_tests/tests/releaseNotifications.spec.ts

@@ -212,9 +212,6 @@ test.describe('Release Notifications', () => {
 
     await comfyPage.setup({ mockReleases: false })
 
-    // Wait a bit to ensure any potential API calls would have been made
-    await comfyPage.page.waitForTimeout(1000)
-
     // Verify no API calls were made
     expect(apiCallCount).toBe(0)
   })