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/StepInterests/index.tsx

@@ -244,6 +244,7 @@ export function StepInterests() {
         ) : (
           <Button
             disabled={saving || !data}
+            testID="onboardingContinue"
             variant="solid"
             color="primary"
             size="large"