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/screens/Onboarding/StepProfile/index.tsx

@@ -268,6 +268,7 @@ export function StepProfile() {
         <OnboardingControls.Portal>
           <View style={[a.gap_md, gtMobile && a.flex_row_reverse]}>
             <Button
+              testID="onboardingContinue"
               variant="solid"
               color="primary"
               size="large"
@@ -279,6 +280,7 @@ export function StepProfile() {
               <ButtonIcon icon={ChevronRight} position="right" />
             </Button>
             <Button
+              testID="onboardingAvatarCreator"
               variant="ghost"
               color="primary"
               size="large"