Improve e2e tests (#8927)

* get e2e image picker working

* verify create account actually reaches onboarding

* wait for image to actually be attached before posting

* wait until login finishes before moving on

* sign out before switch accounts then wait until logged in

* disable onboarding experiments in e2e

* add testId to handle availability checkmark

* fix too long username

* update thread muting test to reflect current behaviour

* hackfix for the british english translation

* unflake the onboarding tests

* fix curate list flow

* admit defeat on the most list one

src/lib/media/picker.web.tsx

@@ -3,7 +3,7 @@ import {type OpenCropperOptions} from 'expo-image-crop-tool'
 import {type PickerImage} from './picker.shared'
 import {type CameraOpts} from './types'
 
-export {openPicker} from './picker.shared'
+export {openPicker, openUnifiedPicker} from './picker.shared'
 
 export async function openCamera(_opts: CameraOpts): Promise<PickerImage> {
   throw new Error('openCamera is not supported on web')