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/Signup/StepHandle/index.tsx

@@ -168,7 +168,10 @@ export function StepHandle() {
               </TextField.GhostText>
             )}
             {isHandleAvailable?.available && (
-              <CheckIcon style={[{color: t.palette.positive_600}, a.z_20]} />
+              <CheckIcon
+                testID="handleAvailableCheck"
+                style={[{color: t.palette.positive_600}, a.z_20]}
+              />
             )}
           </TextField.Root>
         </View>