[Flaky CI]: browser default e2e test: web vital assertions cause flakes

### Flakiness Type

Timeout

### Name of Job

E2E default browser test

### Name of Test

captures a pageload transaction

### Link to Test Run

https://github.com/getsentry/sentry-javascript/actions/runs/10386143526/job/28758328635?pr=12989#step:13:80

### Details

_No response_